I'll pitch in that since youtube was bought by Google it's become pretty anticompetitive too. They've absolutely been caught degrading their product on all browsers except chrome. I've witnessed this numerous times on Firefox on my android. Videos refusing to play, subtitles appearing off the screen, refusing to fullscreen, and at least 3 more annoying things i can't remember anymore.
Incompetence at scale is malice. We're talking about a mega-corporation gobbling up some of the brightest minds of our generation, not some garage startup that is barely able to keep the lights on.