Not federated (yet?) But there is a FOSS Deviant art alternative: https://github.com/Weasyl/weasyl
Pixelfed also has some community features and should work fine for art sharing.
Also check out: https://libregaming.org
Toyota: hold my beer, I’ll call it bZ4X (sic)!
Yes it would be possible via the Pubcrawl ActivityPub plugin of Hubzilla. But since AP is not native to Hubzilla it is a bit hit or miss.
I ran a Hubzilla instance for a few years and ultimately came to the conclusion that it works nicely as a personal cloud for friends and family, but is less suitable for an internet community.
More tools like this would be useful: https://instances.social/
Pretty much the Zot protocol, but mainly build-in Nomadic Identity.
I suspect that they just fail to understand federation 😏