Vivaldi is a nice browser, but doesn't do too well when you look at the technicals. It is also bloated with side panels, email, calendar, notes, etc that I didn't want. Unfortunately Vivaldi and Brave are trying to out "extra" each other.
Why isn’t there a Brave fork yet that gets rid of the crypto junk?
It probably boils down to funding. People need to get paid at the end of the day. The ultimate solution is a paid browser that works only in the user's interest, but people are spoiled now. They want everything for free, and they want it to work perfectly also. The reality is that nothing is free in life. You either pay with money or in another currency (your info).
I would suggest not using sites and services that require a certain browser. That is the only way to counter this attitude of Google. If you have to for your job or something, use Brave only for that and keep everything important on librewolf.