They kind of offer that with their Redis (via Upstash). But for our use-case, we needed it to be managed PG and Redis. Going out of the LAN introduces too much latency.

Upstash Redis for Fly runs on Fly infrastructure and we observe latencies in the low single digit milliseconds.

Maybe that is what Fly had in mind: That some company like Upstash would bring "managed" serverless Postgres to their platform.

Unless somebody natively implements clustering in Postgres I don't see that happening anytime soon, all existing tools require way too many moving parts.

I don't know why they'd even want Postgres for the type of service they are offering, KV or maybe SQLite seem like a better fit.