"There's a difference between releasing software under a FOSS license and running a successful FOSS project. The latter involves a sufficiently large community of developers, ways how they can contribute, ...
"Especially with special purpose code such as an operating system (kernel) for mobile devices, very few people will show interest as long as there is no actual hardware where they can run the software, without or with custom modifications. Sure, there will be academic interest and people who will look at the source code to find ways to exploit potentially existing security weaknesses, but no community of people who work on it since they will practically use it on their own device."
