Any recommendations on paid relays? How does one go about finding such things? 

Also, do any paid relays actually include some kind of service level agreement in terms of uptime and retention? 

 https://github.com/nostr-protocol/nips/pull/230, just need client support 

 That’s interesting for sure. But no info on monetization or data retention policy? 

 Monetization is sort of covered by nip 11. But yeah, it's all kind of underdeveloped