If they were really after kids watching porn (or even porn in general) it would be technically somewhat simple to force ISPs to provide filters on their end as a subscription service. I’m pretty sure I’ve even heard that kind of services in the past. Make it even opt-out if you really want to.
That way ISPs would just ban everything from pornhub and others unless you spesifically want it allowed or even provide a portal where you could block reddit, twitter, tumblr or whatever you wish on your account. That kind of technology already exists and it’s used on many corporate setups.
There’s obviously ways around that, but there’s no technical way to block every possible way to move bits between computers. Even if they would shut down the whole internet there’s still ways to build mesh-networks or even buy USB-drives from a shady alley.
But as we all know, it’s not about porn and not about children.
Yes, for the reasons you mention. And very, very much no. My corporate hat immediately thinks about a crapload of stuff our network drives have which is under various NDAs, restrictions to store outside EU/ETA, restrictions to store even outside our country and so on. At least our accounts have mandatory MFA and other standard safety features, but cloud storage has a different threat model than our local hardware which also makes it’s own little headaches.
I don’t play on the contract/legal field on corporate at all, but I do know that some of those NDAs have numbers big enough to bring the whole circus down and other clauses which can even throw someone in jail if things really go wrong. I just hope I’m not the scapegoat at that point.