> But no-one uses different databases.

I've never worked in a place that didn't use different database. Maybe we're not talking about the same thing, but how are you developing new things if you don't have separate databases? Are you making changes directly on your production database while you're creating new things? How do you test things?

Do you keep everything in the same database, or do you have multiple and then collect data from different APIs?

Not that you need an ORM to have several or indeed different databases. I'd argue that it doesn't even make it that much easier.