I use Firefox. I hate ads. I don't love that Mozilla engages in some level of affiliate deals to pay the bills, but it's the only viable alternative to Google controlling the entire web and doing much worse tracking/advertising at this point, unless Mozilla can figure out some other revenue stream.
Chromium-based "privacy-focused" browsers can only exist as long as they're not popular enough to move the needle on Google's ad business. Firefox derivatives can only exist as long as Mozilla can pay the bills, which they almost certainly can't do if nobody uses Firefox (no reason for Google to pay for search priority for an audience of zero, and no affiliate deals for an audience of zero).
The more people use Firefox forks, the sooner Google controls everything. You might personally benefit in the short term, with "complete" privacy, so I can understand why some might choose that option, but you need to accept that you're contributing to Google's dominance by doing so.