This should be illegal. The fact that they are presently getting away with this speaks to the failures of our legal system.
I paid for the device to do these things. Would it be legal if you changed the rules to say that now all my property is yours for example or you're taking away the device you sold me? It seems brazenly illegal.
Depends on whether you admit that you know your kid did that and then kept using the service without checking the new terms of service. But I don’t think your legal name is xpinchx, so you’re probably good ;)
I'm pretty sure there is some legal version of "you can't force a consumer to give up their legal rights". This is why we need a strong Consumer Protection Bureau.