The blogpost you refer to mentions they are tired of not being able to do this.. So they probably prefer to keep it in MySQL, but as that's not possible, they f

The blogpost you refer to mentions they are tired of not being able to do this.. So they probably prefer to keep it in MySQL, but as that's not possible, they fork instead. The same thing has happened before, with for example the XFree server and the OpenOffice suite, which both had/have terrible patch acceptance policies. The XFree was replaced by XOrg, and some distributions now include the alternative OpenOffice fork, so I guess sometimes that's the only way to go.