I think you're missing something. The entire job of relays is to RELAY messages. To assert that every app building on Nostr must figure out profitable models for relay operators is retarded.

1. This "bloat" only needs to be stored for some medium length time (a month?) then it can be deleted if relays want.

2. Each group using White Noise can decide what relays they want to use. This leaves them wide open to zap (or pay in some other way) those relay operators.