Not enough interesting people. 

Most of the early accounts on here just aren’t very interesting people, at least to the broader world.

Many of those accounts became enshrined here as tastemakers. 

Result is that cringe-y hustle-y, crypto-y people who aren’t interesting in the bigger world do well here in this small one. Which then repels many new people (interesting and not).

Many lackluster accounts, favoring mundane and uninteresting content, leading to a cycle of unappealing content for new users