The European Commission has successfully acted against Microsoft in the past and has repeatedly tried to act against Google on various antitrust concerns.

https://en.wikipedia.org/wiki/Microsoft_Corp_v_Commission

https://www.nytimes.com/2016/07/15/technology/google-europea...

Thanks!

I think, I could be wrong but I think he/she is referring to what the European Union did with Microsoft and asked them to include a way that asks new Windows users to select a default browser and offer them choices besides Internet explorer.

Perhaps he means a similar thing to what they did to Microsoft by forcing them to make it possible to choose a different browser when installing Windows.