Most (all?) open source licenses allow you to sell hosted clusters. They offered a hosted solution well before they changed its license. You can also fork it; but depending on the license, you might need to open-source any fork.

: I don't know of any open source license ones that don't allow someone to sell hosted cluster. Even AGPL, which is copyleft, allows it; so long as the hosted version is either: the same as the open-source version, or it's version is also open-sourced.