Well, guess what?

We could solve this easily by providing services like "pay monthly, get more perks".

While hosting relay, You also serve paid NIP-05 service. But on top of that, If user pays for one subscription, They could store their note forever while kept using their nip-05 address.

And here's the thing.
Why no one has thought doing about this?
nostr:nevent1qqsxpd54sh4qeryffzanmapu7u8pe3euzy4v33sunvrts2ytq9hdpksprfmhxue69uhkymmnw3ezumr9vd682unfveujumn9wshsygrucv52prwm9t7ln7d7w7l07nyrfz0lj7tjrqnav299gtej5frupcpsgqqqqqqs3hh7pl