I like the free market aspect of Nostr relays.

-Any given relay is likely to eventually purge, and thus render notes ephemeral. Not necessarily a bad thing.

-People can pay relays for assurances of more longevity for notes. There is some counterparty risk but otherwise that’s all good too. Counterparty risk can be spread out if someone is willing to pay more for duplication.

-People can go through the time and expense of running their own relay.