I use Firefox exclusively on Desktop and Brave exclusively on mobile. Firefox on Mobile still has performance issues for me.

Samsung is pretty much notorious for this, especially in developing countries where they bundle in every third-party service, PayLater app, shitty mobile game, etc alongside a new device. The only reason they are seen as preferable is that other companies are doing worse (see: Xiaomi).

It’s funny that many small FOSS apps get flak and are hated on because of minor changes to their privacy policy, and then Meta/Facebook basically says they own your entire presence online when you use their app, it’s seen as meh.