The "bad" reason why they are closed: They have the open core, but with key parts closed it's boarder for others to build a solution on top of it, thus they can

The "bad" reason why they are closed: They have the open core, but with key parts closed it's boarder for others to build a solution on top of it, thus they can shovel more integrations with their services in. The "good" reason: Because relicensing of old software is hard and while they want to make it available (to strengthen their position in the developer community) See also my comment in https://news.ycombinator.com/item?id=24048633 https://news.ycombinator.com/item?id=24048633