Why open source databases have achieved dominance
www.theregister.com
We trawled through the licensing terms and spoke to the vendors so you don't have to

For developers, there is no debate. The future of the database is open source. A glance at the 2022 Stack Overflow survey of around 70,000 code-wranglers shows nearly all pros use one of the two leading open source RDBMSes, PostgreSQL (46.5 percent) or MySQL (45.7 percent), although they use other systems as well.