Do you support scaling to zero? I wonder if native offerings of cloud providers (Cloud SQL/Alloydb or Aurora) still make sense as keeping hundreds of PG instances at scale will likely be a challenge if you're managing them from your control plane.

Also, is there any compliance that requires it to be in different Postgresql servers? I assume most companies just use some sort of isolation (tenant_id column or dedicated tenant database/table) so I wonder if this problem could better be solved as a proxy layer.