Why would we want to force a company like Mango to go proprietary? There is a virtuous cycle at work when companies build business models that enable them to stick around and continue to make significant community contributions as Mango has done. The cloud has enabled bad actors to cut off the air supply of contributors. If you care about open source, you should care about the ability for companies to build business models around it that are benevolent to individual users, but don't let parasites suck the life blood out of contributing organizations.