Honestly, not even youtube is THAT dumb a copycat could get EVERY video demonetized, especialy against a channel with 100K+ subs against a random, if that was true, any failed Mukbang video would have taken down the whole genre by this point.
Any successful video plateform will distinguish between videos of the same genre and copyrighted material (and that's without going into how stuff like 're-used content' works)