Deploying multiple databases is typically costly in the infrastructure as a service space. Plus you have more operational overhead in ensuring backups work and

Deploying multiple databases is typically costly in the infrastructure as a service space. Plus you have more operational overhead in ensuring backups work and keeping things secure. It's much easier to use Postgres' schemas to segment the data within one single database. Frankly schemas are much easier to reason about, maintain, scale, and keep compliant than row level security.