You keep repeating it. What is that "closed ecosystem"? What is ecosystem altogether? Jolla is using Mer, which is open and uses open development tools. Jolla OS (whatever will be the final name) will be able to use open libraries from Linux stack (Qt, OpenGL ES, ALSA/PulseAudio, SDL/OpenAL and etc.). What's closed about them? Either be more clear, or stop trolling.