I'm referring to MySQL's very checkered history. Mostly due to MySQL AB wanting to walk the line between proprietary and Open Source, staying as close to the proprietary side as possible while still gaining FOSS benefits.
Required copyright assignment. Selling proprietary licenses. Keeping some of the features proprietary only. The distros being stuck at MySQL version 3.x for release after release due to MySQL AB's licensing games. The mysql.com vs mysql.org snit.
I've always been a bit surprised that they still have a fan base after all that has happened over the years.
Meanwhile, postgresql.org has just quietly made release after release of topnotch, unmistakably FOSS, RDBMS software, in stark contrast to the soap opera over at mysql.com.
BTW, it's your *real* MySQL over at mysql.com that is in the greatest peril right now. The drama continues...