IME The hardware is quite hackable. Schematics are usually available. SoC documentation is available, often times some kind of code is available, Pine64 listens to feedback, pine64 wiki has quite a lot of information, etc, etc. Some of these accessories to the main product surely feel like they started as someone hacking something together and writing about it on the forum, and Pine64 deciding to make it into an product. I guess fingerprint reader backcover for pinephone seems like it came about this way.