Also why mastodon beats twitter, wikipedia outlived brittania and encarta, why email survives, why good old web pages are still a thing, ao3 prevails...
Linux didn't have to beat Windows, just outlast it. Capitalism inevitably overshoots its user base and squeezes blood from a stone. It can't not. Growth past maturity is mandatory. 100% of the market is never enough.
For an example of toxic business models squeezing blood from a stone demanding growth past market saturation, see Adobe: https://toot.cafe/@baldur/109630505660962387
Prudetube HAS a children's mode (which disables all comments and the mini player, but not playing in a window, and prevents you from adding videos to lists via some methods but not others).
But that was created as part of a legal settlement where they got sued for breaking the law by tracking minors, and they made it as useless as possible.
https://youtu.be/JCncSh13x7s