As far as I've come to understand it, MariaDB is a fork of MySQL from the original author, is better maintained, and faster. To take it even further, it practically works as a drop-in replacement of MySQL. Why do developers continue to start new projects using MySQL, and why aren't they busy migrating existing projects to Maria?
Is there a drawback to Maria that I'm not aware of?
To consider trying something new, they would need to expect a big improvement. That's not really what MariaDB promises.