Another problem is related to the instance creation, management and promotion.
From my understanding, only tech people can do that, there aren't many companies providing those services and it's not something average users are interested in.
People chose Cara because they identify with the art aspect of this social network. They don't care if it's anti-libre. They probably don't even know what it means.
The purpose of a federated instance like Pixelfed is to be a blank state. You can do anything with it. Any niche. Art in this case.
The issue here is to bring these people to Pixelfed and make them feel at home within their niche.
Pixelfed already does support the image import from Instagram.
Mastodon doesn't seem to support any import from Twitter/X.
I'm assuming account migration from the main social media platforms to be an important feature.
But I don't think supporting ALL social media is realistic unless they all follow the same norms. Which I really doubt.