you know, attracting users to a instance that aims to be unbiased is a bit of an uphill battle on a network where many if not most of the major instances are run by people who are part of the same echo chamber and thus have both a belief system and a reputation to defend.

long-time users who leave this bubble will leave many of their friends behind because of the blocking policies and shared block lists, and risk getting their reputations tarnished through guilt by association.

new users never see these instances. they've been on-boarded and fulled through to one of the "approved" instances, and by the time they realise there are other options, it's too late.

the most successful attempt at running such an instance is probably noagendasocial.com, because Adam Curry has a big following and it recruited its users from outside this bubble, so it can stand on its own legs. it also helps that most users are fans of the show and thus have something to talk about and bond over.