The only one we have so far is that we blocked YouTube at the router level.
YouTube (and YouTube Kids etc.) is down-right creepy when kids get hold of it.
The kids will watch things like Netflix or Amazon Prime for a bit, get bored, and do something else. They'll play stuff like Minecraft for a bit and move on too. But put them in front of YouTube and they will sit there all day watching banal, repetitive, shockingly obnoxious, and sometimes creepy and disturbing content. Sometimes the younger ones will literally urinate on themselves because they are so transfixed by YouTube.
What's even spookier is that the same content on normal streaming networks does not have the same effect. There's a young kids show called Blippi that they watched on YouTube before we banned it. They'd watch it all day on YouTube. Then after our ban it showed upon Amazon Prime. They found it there and will watch it... occasionally... for a bit.
There is something about YouTube's design and algorithm that's a perfect Skinner box for humans, and it works disturbingly well for children.
P.S. the adult behavior often involves a powerful "rabbit hole" effect where you watch one political or ideological video and you get profiled and served tons more like it. Combined with the Skinner box effect it has and it's like some weird dystopia where you get Clockwork Orange style brainwashing but get to pick what you're brainwashed with. Reminds me of a skit Monty Python would have done:
"Hello sir, I'm here for the brainwashing. Can I see a menu?"
"Certainly, sir! Today's we have a half off special on Leninism and UFO abductee cults..."
"Do you have holocaust denial?"
"Hmm... I think we may be out of that one. Would you like some tankie gulag denial instead?"