Your job as a parent is to train your kid to be a functional adult, not impose counterproductive and arbitrary restrictions because you're frightened by something you don't understand.
Any parent who goes to war with their kid over the mere watching of Mr Beast really needs to consider their priorities in life, and if they're just taking out their insecurities on their kid.
Raise your kids or watch the world raise your kids for you.
If you think that certain media is imparting negative morals on your child, then it's on you to control that. On the other hand if you think it's unusual, but ultimately harmless, then it's also your prerogative as a parent to allow them to watch it.
But the whole stance of "I can't control what my kids are doing because they'll resent me if I do" just sounds like an excuse to deny your own agency over the situation.
Any parent who goes to war with their kid over the mere watching of Mr Beast really needs to consider their priorities in life, and if they're just taking out their insecurities on their kid.