In its case targeting how Google buys and sells online advertising in Canada, the Competition Bureau says the company "has abused its dominant position." But those who study the tech giant say reducing its market influence won't be easy.

Canada's antitrust watchdog is suing Google to force the breakup of the company’s ad tech unit. In a statement published Thursday, during the US Thanksgiving holiday, the Competition Bureau said a “thorough” investigation had found that Google had abused its dominant position in programmatic web advertising to “maintain and entrench its market power.

The Competition Bureau is suing Google over alleged anticompetitive conduct in the tech giant’s online advertising business and wants the company to sell off two of its services and pay a penalty.