No, thank you
> Cost is… truly unknown until after the migration is done.
Right.
> users should ask about the cost implications
Not to mention the privacy implications.
If you *really* are in a situation where you find yourself constantly having to spin up new database instances for replication, etc., you would use a Docker image or similar, that you control and can run in whichever platform(s) you fancy.
But I guess most users will need one database and perhaps one or more replication servers, so it's not that difficult to spec that into your project and configure in an optimal way for your intended use.