Some clarification, most browsers today are indeed Chromium based and that is shit, because webdevelopers usually only target Chromium based browsers when developing and it results in all sorts of problems for everything else (Firefox and Safari).
But Chromium is opensource, it gets contributions from the open source community, and that is one of the reasons why it became so widely used, not because Google trapped people into it and didn't allow for them to leave anymore.
Google is not good, they are an absolute shit company, especially when it comes to dealing with user data, but they don't hold a monopoly on the browser market...
Also saying Microsoft has only been successful due to having "multiple successful businesses" also just shows how biased your opinion is.