[suttol]

I'm pretty sure from my experience it's not a shared instance - you can create multiple databases easily.

The limitations are presumably so that they have control over settings for things like replication and their features that you can't mess with.

[sk5t]

Indeed, not only can one create multiple databases on one RDS instance, but it's also OK start an RDS instance with no user database at all, and create it later.

[wryun]

We're heavily using multiple databases on a single Postgres RDS. Yes, occasionally it's annoying not having a true superuser, but now they've improved it so you can still have 'fake superuser' reserved connections it's ok.