I don't find this argument compelling because you're selectively applying logic.

Okay, so you don't like AWS or Google. Fine. What about the thousands of other hosting companies that use Linux, Apache, Nginx, PHP, Ruby, Python, and Perl for their offerings? Are Yunohost and Dreamhost evil for using Postgres and not open-sourcing their orchestration layer?

The precise reason I build my sites on top of Linux and Apache and Postgres is because I can switch hosts at any time. But what you're advocating for is being completely locked in to the hosting service that is controlled by the company that happened to have authored the database. I would never use a product from a company that had that attitude because I would be completely beholden to them.

I get your frustration that AWS and Google make it hard for database vendors to release their work under a truly open source license. But what you're advocating for would destroy a huge amount of the value of self-hosting and open-source.