Default settings are fairly lucrative - the reason why Bing and Edge are somehow viable search engines and browsers is purely because Microsoft ships them as default on Windows. Depending on who you ask, Firefox is either the same or double the browser marketshare of Edge, so that default search setting is still lucrative, if only so that Bing, Yahoo, or DuckDuckGo don't get any of that default search traffic.

Also, while lots of people gripe about Google adtech, they aren't angry about it enough to switch search engines. The company still has the best search in the business, specifically because they have a detailed profile on you. Furthermore, they're still moderately trustworthy by tech company standards. At least for me, I'd rather trust Google or Microsoft than, say, Facebook. My biggest concern with any new Google service is less "will I lose control of my data" and more "will this service stay live for longer than a year or two".