That was overblown drama. They didn’t change anything in practice. They clarified things by writing it down. You disable some defaults and have no issue. Even if you don’t, it’s not nearly as bad as other popular platforms.
I never stopped using Firefox.
If you want I can look for a comment I made quoting the relevant terms a while back. Or you can look for it yourself.
Simple forks still depend on upstream. I’d rather support Mozilla than not, given no better sustainable alternative. They do some good stuff like Firefox, Thunderbird, and mdn.
How much of that is true? What did they sell? Is the conclusion even valid, given the (popular) alternatives?