Yup, I'm not letting my kids on Twitch because of that.
I hate kiddie accounts, so if I don't trust my kid to browse a service safely, I ban it. As they gain my trust, I open up the services I allow. For example, I used to have a "no YouTube" rule, now I let my oldest (10yo) to browse on his own, provided he tells me what he wants to watch. If I catch him watching something he knows I don't approve of, he'll lose that privilege until he regains that trust.
Twitch will take a while.