because there will exist relays to serve anyone, some to serve a client’s users, some paid, so on

people will not want to spin up a relay for a small community, and would rather use infra they pay for

one reason reddit wins imo because it is way simpler to spin up a community, you do not need hosting expertise, you do not need to pay for expensive relay hosting (there’s a reason web hosts share one mysql deployment across multiple tenants)