> So the whole issue boils down to "what if you get into a patent dispute with Facebook over a patent that doesn't relate to their core web UI tech". Which...I dunno, is that a real concern?

Yes!

On one hand, tons of HN commenters claim to be opposed to 1) NPEs going after smaller software concerns 2) giant ecosystem software vendors being the only choice when it comes to mobile/web technologies, but then this amateurish ¯\_(ツ)_/¯ mindset carries the day on easily graspable concepts that directly affect the likelihood of patent infringement.

> But if my core business is making apps, then every patent I might have is likely to be covered by both patent grant termination clauses. So the issue is...?

Given the increasingly broader markets that Facebook, Amazon, et al. want to break into, the issue is for businesses whose core business doesn't relate to apps but that still want to leverage modern software (aka all of them).

Stop brushing off issues you don't understand and calling them FUD.