* legacy applications or vendor lock-in * use of a cloud provider that favours another database (like SQL server) * some people claim mysql/maria is faster fo

* legacy applications or vendor lock-in * use of a cloud provider that favours another database (like SQL server) * some people claim mysql/maria is faster for them, simpler, or has a better support for replication * use of sqlite for lightweight or portable apps * domain specific databases that still use sql as their query language * someone may want to use another database for fun or to learn something new