Unfortunately, most parents are not tech savvy and don't understand Twitch or how kids use the internet at all. On the face of it to most parents it just looks like a gaming thing. To these people the internet is basically platforms like Facebook on their phones. When they eventually hopefully catch little Johnny watching furry penises on Twitch it's already too late and a lot of parents lack even the parenting skills to deal with that appropriately. Sadly, it doesn't take much intelligence to procreate.

Personally, I've just blocked Twitch outright on my firewall with this change in policy for my kids and continue to monitor what they do as always. But fortunately unlike the majority of parents I actually know how to deal with it either way.