Interesting, I will have to investigate how this propagates through to their underlying database. I'm guessing this just changes where the data is being written

Interesting, I will have to investigate how this propagates through to their underlying database. I'm guessing this just changes where the data is being written inside a Firebase project? There are several strategies for multi-tenancy in postgres. You can create a completely new database, a schema, or a have the tenancy as rules/logic in the same schema. I'd prefer the latter right now since RLS enables it so easily and it's more flexible - you can create the policies for your own tenancy structure.