YouTube rule changes means their content can't be monetized. That's why all creators went to other platforms. Battle raps problem is that there aren't enough people worth paying for, and not enough people willing to pay for them. It's a niche market that the wild days of YouTube allowed to flourish - but battle rap is and will be underground always for a reason.
What changes did YouTube make and did it affect content creators as a whole or was is more about all the spicy talk that these battle rap cats are known for?