The Problem is that GCP doesn't run an RDS service with PostgreSQL. And external vendors are mostly more costly than AWS RDS. Especially for some customer homepages where you want to run on managed stuff as cheap as possible.
This is sad for sure. The new MySQL cloud 2.0 is really good, and if you use a DB agnostic ORM you can probably make MySQL work for quite a while. Sad to lose access to all the new PG features though, and I would love if Google expanded their cloud SQL offerings..
