So I think, but I'm not sure, this is for group chats. Group chats are only encrypted to/from the server because the server broadcasts the message to each recipient. As the messages are unencrypted on the server, they can feed them to LLMs. This is different to Signal. On Signal it's your phone encrypting each copy of the message before sending to each recipient individually.

we're at war with eastasia. We've always been at war with eastasia. Big Brother Really has "trust me bro" energy.

Haha I'm kidding, it's good that you share your solution here.

I think you're missing some key points. Any file hosting service, no matter what, will have to deal with CSAM as long as people are able to upload to it. No matter what. This is an inescapable fact of hosting and the internet in general. Because CSAM is so ubiquitous and constant, one can only do so much to moderate any services, whether they're a large corporation are someone with a server in their closet. All of the larger platforms like 'meta', google, etc., mostly outsource that moderation to workers in developing countries so they don't have to also provide mental health counselling, but that's another story. The reason they own their own hardware is because the hosting services can and will disable your account and take down your servers if there's even a whiff of CSAM. Since it's a constant threat, it's better to own your own hardware and host everything from your closet so you don't have to eat the downtime and wait for some poor bastard in Nigeria to look through your logs and reinstate your account (not sure how that works exactly though).

I remember an Arthur Clarke novel where a space ship needs water from the planet below. The easiest thing is to lower cables from space and then lift some ice bergs.

https://archive.org/details/swgrap

Internet access should be a utility like electricity and water until all three, along with housing, medicine, and food, can be free to all.