On March 4, 2026, Canada's Competition Tribunal dismissed Google's constitutional challenge to the country's landmark ad tech lawsuit, removing the single largest procedural barrier in what may be the most consequential antitrust action in Canadian history. With that hurdle cleared, the case — Competition Bureau v. Google, file CT-2024-010 — now heads toward a full liability hearing in which the Bureau is seeking not just financial penalties potentially reaching C$91 billion, but the forced divestiture of two of Google's core ad tech products.
The ruling matters well beyond Canada's borders. It signals that mid-sized democracies, equipped with the right statutory tools, can mount credible enforcement challenges to platforms whose global revenues dwarf the GDP of many enforcement jurisdictions. And it arrives as Canada's Competition Act — overhauled three times in three years — is being tested in real litigation for the first time at this scale.
What the Bureau Is Alleging
The Competition Bureau filed its application against Google on November 28, 2024, alleging abuse of its dominant position in Canada's online advertising technology market since at least 2008. The allegations are specific: Google is accused of tying its advertising tools together to foreclose competition, providing preferential inventory access to its own products, and deliberately taking negative margins on certain transactions to undercut rivals.
The Bureau's market share claims are stark. According to its application, Google controls approximately 90% of Canadian publisher ad servers, 70% of advertiser networks, 60% of demand-side platforms, and 50% of ad exchanges. If those figures hold up, they describe a vertically integrated stack in which Google operates simultaneously as auctioneer, buyer, and seller — setting the rules for everyone else.
The remedies sought match that diagnosis. Beyond monetary penalties, the Bureau is asking the Tribunal to order Google to divest DoubleClick for Publishers (DFP) and AdX — the two products sitting at the choke points of the supply chain.
The Constitutional Battle and What the Tribunal Found
Google's constitutional challenge, filed February 14, 2025, argued that potential penalties were so severe as to constitute criminal punishment, triggering Charter of Rights and Freedoms protections available only in penal proceedings. The penalty at issue is grounded in section 79(3.1)(b) of the Competition Act, which allows administrative monetary penalties of up to three percent of annual worldwide gross revenues — applied across the alleged 16-year conduct period, Google estimated this could reach C$91 billion, which it called "shocking, gargantuan" and "unprecedented in Canadian history."
Judge Andrew Little rejected the argument. He found the potential penalty was "hypothetical at best" at this stage, and that such penalties "may be necessary to deter non-compliance." The Acting Commissioner of Competition welcomed the ruling, stating it "reinforced the Tribunal's clear authority to order administrative monetary penalties to promote compliance and deter anti-competitive behaviour."
The decision is correct on the threshold question. Administrative penalties — even large ones — are not equivalent to criminal punishment. Purpose matters, and deterrence is a legitimate regulatory objective. But the magnitude of the C$91 billion figure should still prompt a proportionality discussion once liability is established.
Three Waves of Legislative Reform
The Bureau's ability to bring this case reflects a deliberate policy transformation. Canada's Competition Act was substantially overhauled three times between 2022 and 2024. The 2022 amendments introduced digital-economy factors into abuse of dominance analysis — network effects, consumer privacy, innovation impact — and gave private parties access to the Tribunal for the first time. The 2023 amendments (Bill C-56, royal assent December 15, 2023) lowered the evidentiary burden, allowing the Tribunal to find abuse of dominance based on anticompetitive effects alone, without proving intent. The 2024 amendments (Bill C-59, royal assent June 20, 2024) added "excessive and unfair selling prices" as an anticompetitive act category and codified the Bureau's market study powers with compulsion authority.
These were deliberate legislative choices made with digital platform enforcement squarely in mind. They built the legal foundation the Bureau is now using.
The Case for the Bureau — and Its Limits
The strongest argument for aggressive enforcement here is structural. If Google's alleged market shares are proven, they describe a platform that faces effectively no competitive check at multiple layers of the advertising stack. Publishers cannot meaningfully switch ad servers without forfeiting Google's demand. Advertisers cannot opt out without losing reach. That kind of lock-in produces real economic harm — higher costs, lower publisher revenues, reduced innovation — and it does not self-correct through market forces alone.
But calibration matters. A penalty calculated against 16 years of worldwide gross revenues is not a proportionate remedy for a Canadian market impact. Keldon Bester of the Canadian Anti-Monopoly Project put the right framing plainly: "Financial penalties will always be secondary to structural remedies that promote competition." Forcing Google to divest DFP and AdX — restoring independent competition at the publisher ad server and exchange layers — is the analytically correct remedy. A structural fix that resets market conditions is worth far more than a record-setting fine that flows to government coffers and changes nothing about market structure.
Canada as a Coordination Model
The Canadian case is proceeding in practical parallel with the US Department of Justice's ad tech action. In April 2026, the Tribunal ordered Google to confirm the accuracy of witness testimony from the US DOJ proceedings — a direct acknowledgement that evidence developed in one jurisdiction can inform another without duplicating expensive litigation. That cross-border coordination reflects a maturing approach to global platform enforcement.
Canada's enforcement trajectory — a revamped Competition Act, a Commissioner willing to use it, and a Bureau operating with 527 staff and a C$58.9 million budget — demonstrates that a mid-sized authority can construct and sustain a credible case against a globally dominant platform. The constitutional hurdle cleared in March was the hard part. What comes next — building the liability record and securing structural remedies — will determine whether the case delivers on its early promise.