Too Long; Didn't Read
In the last decade we've seen $10B of capital go into bigger and bigger deals in the open source software world. Cloudera, Map and Hortonworks with Hadoop, GitHub with git, MongoDB for its eponymous database, Elastic providing Elasticsearch and beyond. There's three main business models that open source companies have pursued, all successfully. As the market landscape has shifted some of them have become more dominant than others, though the businesses that have been built exploit the key needs that larger enterprise customers have, above and beyond just functional code.