Is it more that they're against acquisitions in general, or specifically an acquisition by Oracle, widely considered one of the eviler tech companies?
Oracle is not a tech company but a law firm that happens to have an engineering department.
Edit: my bad - Sun acquired it, not Oracle. Made me all sad for Suns demise again.
I too am a fan of what Oracle did for MySQL. There haven't been any major releases since 2018, though. Since their development process is closed, I am wondering when/if are we going to see MySQL 9 (if it's anything like 8, it's going to be huge).
https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html
MariaDB initially went through a process of adding absolutely everything they could into the database (e.g: many additional storage engines like Cassandra and TokuDB), most of which since have been removed. It felt less like it was driven by a strong engineering process, and more like let's throw everything and see what sticks (not much did).
MySQL since 8.0 is on a "rolling release" model, where features were shipped as part of 8.0 once they were finished instead of waiting for a 9.0 release. Thus 8.0 got quite a few improvements since 8.0.0.
Recently they announced a new model where they split LTS style versions and increase version number, again, but features still appear as they are done and not for a big release: https://blogs.oracle.com/mysql/post/introducing-mysql-innova...