Really wish they didn't .  Their own os means they won't want to release firmware for their devices.  If they released all the drivers and firmware people would be able to create graphene os distributions ASAP without any cost to them.

Sad to see they wanna take that route  

 https://www.daylighthacker.wiki/roms 👀 Even Linux support is listed. 

 Click on "embark on your Linux journey" link, it's blank.  Does it work? Is the screen functioning user Ubuntu touch? Sleep/wake? Etc