While on a technical level, the fediverse is entirely capable of something similar to Amino, and a platform could be created that replicates its functionality 1:1, I believe the main problem is one of image.

On the outside, the fediverse is seen as an overly “nerd-centric” place, a place where “they only talk about Linux, FOSS,” and “nerdy” things in general. And it’s often the discussions around those topics that seem to have the most visibility around here, while the few communities about hobbies and fandoms that you can find have mostly modest to low interaction.

The thing is, no one likes to feel like they’re talking to themselves. That’s why many artists and people immersed in their fandoms gravitate to places like BlueSky or Tumblr, or don’t want to leave a cesspool like Twitter, even with their more hostile environments towards them: they have the perception that in those places they will have more opportunity to interact, whether that perception is unfounded or not.

If one create a platform like Amino, for fandoms and communities, I think the technical aspects are the least important thing. One have to create an image of an environment that is attractive and enjoyable so that people who are not so interested in technology will want to join.