Bitcoin does actually have mass appeal, but people don't want to be on a social media about it lol. They've also said this over and over again. Their complaints are mostly rubbished and ignored.
Discussion
I think it has mass appeal currently as a ponzi scheme that fools everyone into being more free.
The problem isn't that nostr is rife with bitcoiners. The bitcoiners are here, because its first class feature offerings literally address bitcoiner primary concerns. So instead of overwhelming the Bitcoin weirdo flavor of nostr, you have to make more freedom weirdos.