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it's hard to make a general rule in this case
some streamers probably care
some others probably don't
This. That's why it's more of a problem really not on the streaming site but rather on the user themselves, Since let's say the streamers does indeed put the block, that's just on their side, if the user side wants to bypass it they easily can so it needs both parties really to adhere to the rules. Though I'd say rules are dead on the internet since, well, it's the internet. I'd really suggest that they just rather teach it themselves to their kids, better informed than ignorant since ignorance breeds curiosity after all, and would only lead to falling in deeper I say.