That's what it was originally for. It was so that you could distinguish a celebritie's real account, from the many fake accounts using that same name for fun/sa

That's what it was originally for. It was so that you could distinguish a celebritie's real account, from the many fake accounts using that same name for fun/satire/just because. But then, Twitter realised it could make money from the increased engagement blue check marked accounts generate. So it became exclusive. And then when they realised they'd be publicly/socially liable when celebrities said things Twitter the company didn't like, Twitter threatened removal of the check mark. So the check mark became Twitters stamp of approval to use, and be popular on, their platform. The blue check mark should only ever have been a way to say "the name and identity I claim to have on their profile has been verified". That should be open to Leonardo DeCaprio, and John Smith down the street.