Success definitely seemed cool to consumers at the time rather than the old mentality of calling them "sellouts" in years prior. It usually meant decent press coverage, notability in some way (thus impersonation was damaging), or you'd hit 50 IMDb credits.
I do however agree that the current implementation of blue checks is absolutely meaningless and lends credibility to random people, as such, I don't browse Twitter anymore as the replies to tweets are full of "experts" claiming x without sources, but the blue check seems to convince a lot of people in terms of the weight of their argument if the stats on their tweets are anything to go by.