You be you, just warning you right now so don’t bakc sith another post “Guys I bricked my Kindle”
It is both - it is hard to add anything (safely) to upstart on Kindle.
On KOReader side, if say KOReader crashes on startup, and it is part of upstart, the upstart will not be happy and send you to a restart. That means it will be in a loop, so that’s probably why I haven’t seen it done yet