Like most things Apple it comes down to good marketing. Even though almost all their end products are closed-source and some are even in a closed ecosystem, th

Like most things Apple it comes down to good marketing. Even though almost all their end products are closed-source and some are even in a closed ecosystem, there tool-chain for building these products is almost all open source and based on standards. In general they greatly contribute to the open source projects they use. This probably allows most people to rationalize championing both openness and Apple at the same time. So while I don't own any Apple products, I do appreciate the projects they have contributed to.