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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.
Ignorance leads you to false beliefs. You need to be careful following whatever you see on the internet. This example should serve as learning not to just blindly follow what the streamers are telling you, but instead make your own assessment and make sure that you fully understand all those things that you are watching.
Online have a lot to offer, getting curious is not a crime but a responsibility. You need to be held responsible in each action that you'll going to take.
Be informed and allow yourself to understand deeper.
As due to being fan of the streamer some of them too much support they are even supporting the platform promoting by the streamers and even though they didn't research how it use, the faqs and terms & conditions and read those important details how and what is the rule of the platform. This lead towards having mistakes and troubles to use their platform for their customer. Also, it's better if there's a guide by the streamer to their viewers and supports, of course, they are paid to promote they need to give a good reputation and image like helping their users or supporters.