The authority’s investigation took four years and followed a complaint filed by Gibmedia, a French company that manages a range of websites offering weather forecasts, corporate data and directories.
Gibmedia had accused Google of having suspended its Google Ads account without notice.
“The way the rules are applied give Google a power of life or death over some small businesses that live only on this kind of service,” the head of the authority, Isabelle de Silva, said at a news conference.
The French regulator said Google had a lack of objectivity and predictability in defining the rules on Google Ads, the gateway for advertisers that wish to appear in the sponsored section of search results.
With a market share of around 90% in the online search business, Google has a responsibility to offer a fair access to Google Ads, the regulator added.