Might even pay for it xD

Their must be a preserving option. Or a shitpost checkbox to tik. Paid or unpaid. That would save a lot of resources.

We have a spec for note expiration. Relays might already follow it - it's just missing in clients right now (afaik only NOS Social has it).

Expiration is different. The note expires for all relays. It doesn't allow you to send an expiring note now and later revert it back to non expiring when you move your notes from a free relay to a longer term storage.