I switched my family off Google after almost 20 years on our own domain. In hindsight it was ridiculously easy, although there are still some weird Google account required links that ultimately have me just moving on. Yt does run worse on FF but that's because of unlock (I believe) they tend to stall out intentionally instead of showing you ads and attempt to get you to switch.

Yeah, I believe the stall-out issue is sabotage, but it also visibly takes longer to just render the page. On FF, a YT page jumps around for almost two whole seconds while it renders for me (not to play the video - to render the page). This may also be sabotage by Google, I don't know.