I didn't look too much into this, but is it possible that the increase of censorship isn't just that Kidz Bop is stricter now, but that pop music today has more profanity?

>Kidz Bop is teaching gender role conformity and race identification and pushing kids to grow up quicker, a sociological phenomena known as “kids getting older younger” (KGOY).

This is another weird thing. It's assumed that we're all legally kids until 18 now, and that's being extended with more people attending college and it often being seen as a time to have fun, relax, and enjoy yourself without serious responsibility. Many of our ancestors were working jobs at 13 and some were having kids of their own. Not to say that's the way it should be, but recent trends make it feel like childhood has extended. I personally didn't really feel like an adult until solidly into my mid-20s.

Edit: It seems like "kids" here might be referring to smaller children acting like teenagers. Even in that case, I think little kids playing with toys and games all day is fairly new. Most were doing chores or actual work throughout history.