You either use Firefox, Edge (fork of Chrome), or Chrome today. Serious companies and the average person only use Chrome or Edge. Anyone serious about privacy is using Tor. Hipsters acting like they're serious about privacy are compiling Firefox or Chromium from source.

"Selling users off" only matters to anyone trying to push some unheard of and less-secure forks of Chrome or Firefox. Nobody notable code-reviews theses browsers, you're at the mercy at some random person or small group to play catch-up with upstream browsers, and you're ultimately still locked into somebody else's decisions.

I use Firefox because double-clicking code one-liners from my wiki doesn't add a newline when pasted into Terminals on Linux, which I use on desktop for the challenge of it. Windows Terminal on Windows doesn't have this issue from any browser and I'm free to use Edge or Chrome there.