Have to admit my main awareness of mariadb was that it is a compatible mysql fork that I use interchangeably depending on if my internal PRNG spits out "mysql" or "mariadb" at the start of a project.
I was aware that mysql has a paid version with some form of scalable clustering, and one of the things mariadb adds compared to the open source version of mysql is (not very scalable) clustering. I was not aware mariadb had a paid version with scalable clustering until I just looked it up...
...would the commercial mariadb going broke mean the open source project would no longer be incentivised to "ignore" proper clustering support? If so, I hope the new owners saddle them with billions in unrepayable debt :)