Most of the time, you're not likely to see discord runs in an instance you're in. And it's likely only going to be at peak hours.
That could be possible for sure. I've been in FCs that have done complete Alliance Raid runs on release as an FC, for example. But then of course we circle back to how most FCs have a discord server and then suddenly it's a villain too.I guess it's somewhat academic in the sense a pug group forming organically is pretty unlikely, but FCs might attempt it.