General Discussion

I think OP is moreso referring to the actual communities than users themselves. Parking empty user accounts is one thing, as they exist but don't really cause any issues, but empty communities may lead to unmoderated places, a lack of rules, etc.

I do imagine with the influx of bots those ghost accounts could get purged though. At least using them once to have some traceable account activity would be enough to have them persist through an initial wave.