A user claiming to be a former dev also indicates you should no longer trust OTA updates:
https://www.reddit.com/r/programming/comments/5k55vo/the_dea...
https://www.reddit.com/r/programming/comments/5k55vo/the_dea...
Any speculation on what this might be? User data?
Non standardized poorly engineered/proprietary HW and poorly documented SoC makes it impossible for an OS to survive without the support of big companies.
FOSS massively benefits nowadays the worst actors on the HW/SW markets possible. If you wait long enough you will see the heroes turn into the villains. (cf The Watchmen).
This is really only true of OSS, not Free (Libre) Software, which is why that distinction is so important.