Comment by evanelias

MariaDB is widely used, including by some extremely high-traffic sites like Wikipedia [1], as well as some quite large multinational businesses [2].

It may not be as widespread as MySQL, but that's no surprise; despite HN's disdain, MySQL is still one of the most widely-used open source databases in existence.

[1] https://wikitech.wikimedia.org/wiki/MariaDB

[2] https://mariadb.com/resources/customer-stories/