The DB vendor who created the database is worse at running it than AWS? No, that isn't true.
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.
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.