>MariaDB is also somewhat widely used, but not nearly as much as MySQL.
I believe this is factually false. Consider just one datapoint:
I believe this is factually false. Consider just one datapoint:
I've been working in the MySQL/MariaDB ecosystem for 21 years and am the creator/maintainer of a MySQL and MariaDB specific schema management utility used by hundreds of companies and with over 1.6 million downloads to date. I can tell you conclusively, MySQL usage in the industry significantly exceeds MariaDB's.
While I personally enjoy both systems and do hope MariaDB adoption increases, this doesn't change the facts on the ground. And unfortunately MRDB is a penny stock, Azure is dropping their managed MariaDB offering, Vitess has dropped MariaDB support entirely, AWS Aurora is compatible with MySQL and not MariaDB, Percona Server is based on MySQL and not MariaDB, and so forth.
In any case it's not very relevant to this thread because you're quite right in pointing out that MySQL uses a free software license (GPL).
As for both working with anecdata, I mean sure, but what else is there? I'm citing my own business's direct experience with MySQL users and customers significantly outnumbering MariaDB users and customers, and seeing clear signs of that trend also being true at several much larger businesses (AWS, Azure, Percona, PlanetScale).
I suspect your view may be skewed by Linux distros / package managers having replaced MySQL with MariaDB many years ago. But even that is starting to change, see https://lwn.net/Articles/960630/ for example.