They are in fact, related. The Linux Distro's are OEMs. the larger ones happen t...

They are in fact, related. The Linux Distro's are OEMs. the larger ones happen to be more responsive OEM's than the OEM's on the android side.

But there are plenty of crappy, not-updated-that-often linux distros that strand users too!

Just like in android, on GNU/Linux you are dependent on how good your OEM is, and what they provide you in terms of a security update mechanism/times.