Sure they do.

AWS RDS, Azure Database for PostgreSQL, etc. are all "pro" / "officially supported" deployments of PostgreSQL.

On top of that the PostgreSQL official website even lists a whole table full of vendors from whom you can get commercial support at https://www.postgresql.org/support/professional_support/nort...

Bringing faux open source into the world isn't a justification for adopting an infeasible business model and then complaining that your business doesn't compete very well.