i'd agree, but go further and say less than 1/1000 users are not going to jump in with at least one legit person to start off with, probably more like 1/10000

and so long as the clients default to networks composed of mostly real people

fake networks and fake relays are in the same category as scams in general, and probably the subject matter of such fake networks would be pump and dump and other kinds of scammy shitcoinery