An anonymous reader writes: In a Network World article, Marten Mickos, former CEO of MySQL, talks about his opinions on a future open core world. His previous attempts at close sourcing open source software ended up with Sun pulling the plug on his plans. In the article he states his opinion that in order to derive revenue from open source, that some piece of it must be closed source. He mentioning that Eucalyptus is headed this way. Does this point to Ubuntu Cloud being eventually crippled in order to drive revenue back to his company?