In a world where hosting services are responsible that way, their filtering would need to be even more sensitive than it is today, and plenty of places already produce unreasonable amounts of false positives.

As it stands, I have a bunch of photos on my phone that would almost certainly get flagged by over-eager/overly sensitive child porn detection — close friends and family sending me photos of their kids at the beach. I've helped bathe and dress some of those kids. There's nothing nefarious about any of it, but it's close enough that services wouldn't take the risk, and that would be a loss to us all.

They'd all have to read your emails to ensure you don't plan child sex parties. Whenever a keyword match comes up, your account will immediately be deleted.

EncroChat was illegal because it was targeted at drug dealers, advertised for use in drug dealing. And they got evidence by texting "My associate got busted dealing drugs. Can you wipe his device?" and it was wiped. There's an actual knowledge component which is very important here.