Maybe OP’s instance defederated from it. There have been allegations of CSAM on that and the prior Fediverse NSFW instance.

The issue with porn instances isn’t piracy. If the copyright owner isn’t getting paid, it’s kind of all piracy. The issue is that if you don’t have a direct established connection to the source material, you can’t prove it’s not CSAM, especially when that’s what everyone’s going for, the whole “looks 13 but is really 18” look you see on so many NSFW subs. The focus on small breasts, the near ban on tattoos and piercings, the clean shave/wax, and the innocent look, sometimes involving schoolgirl attire like pleated plaid skirts, white shirts with a tie, and backpacks and lunchboxes that look like they come from grade school. It’s a whole thing and it’s kind of disgusting. The legal sellers keep the receipts: they have the performers’ government IDs on file and they can say that every performer is 18+ and willing. Out on the wild web though… you really don’t know, and since the illusion is that they aren’t, the burden of proof falls to the person posting it — or the instance hosting it. Which is why a lot of them get defederated. No one wants that headache.

I’ve even seen piracy sites — sites that have no problem posting the latest movies, games, TV shows/sporting events, albums, books, and whatnot, straight up say that porn is not allowed. If they aren’t willing to deal with accusations of hosting CSAM, and they host pirated materials (or the means to get them, in the case of torrents), you can imagine how hard it is for a social media site/Fediverse instance.

…Also, OP’s link is bad. That could just be on my end, dbzer0 might have blocked the comm on their end. Or maybe OP posted the link wrong. They’re using the URL formatting and we link to comms starting with an !, so that might not work in a markdown URL link. OP may just have to post them in cleartext.