AWS can launch so many services since they are not developing any of them and are just stealing the open source contributions of other companies/developers without contributing anything back.
Vendors should compete by creating their own cloud offerings, and many are finally getting around to it.
For example, why hasn't Datastax rolled out a cloud offering on AWS yet? All this time and they have no solution. Even ScyllaDB just launched a minimal service this year. I would expect a db vendor to be able to wire up some APIs and at least get a basic deployment running instead of complaining about AWS offering it first.
(the one they don't have is the ability to offer super specialized support and modifications for their customers, which is where a lot of the database companies have made their money - on consulting)
If you don't want others using your source code then don't be open source or use a different license. There are thousands of closed proprietary products out there doing just fine, for example all of AWS own managed services.
Umm... they do (https://www.datastax.com/platform/amazon-web-services). Instacluster also has an offering. Which kind of highlights the problem.
There's no expectation of contribution with open-source software and the vast majority of users don't add anything. That's how it goes. If you don't want to give it away, then simply don't give it away.
DB vendors earn revenue by charging for features, support and services, just like AWS. There's nothing stopping them from selling proprietary closed-source products and I can name dozens that are doing well.
If they're changing licenses now then good for them, but you could say they also took advantage of the free marketing from open-source and now put most of the development into enterprise versions. There's no right vs wrong side here.
Do you also have a complaint against the numerous vendors offering managed Postgres? Or is this just relegated to some databases you specifically like?