It doesn’t meet every requirement you listed but privatebin.info supports file attachments, configurable expirey, and burn-on-read, and is fully end to end encrypted

1 step forward, 4 steps back!

It can be both though.

that’s why the fediverse exists

The collapse won’t stop ai output from spamming the internet though. It will just make it worse and more likely to be incorrect

dead internet theory is self-fulfilling