Looks like obo.sh is dead. Remember when I remarked that they weren't gonna survive if they didn't stop the CP problem? Apparently, 107 deactivated accounts of the 709 that federated this way. Fedilist hasn't seen them since 2023-06-02: http://demo.fedilist.com/instance/obo.sh

Anyway, Cloudflare seems to have dropped them, and unless they switched VPSs, their old IP (198.46.190.102) is also dead, and the registrar indicates the domain was updated 2023-06-08. This is probably why the uptick in people signing up and then bashing "child porn" into the search box. (That search term, incidentally, does not yield the results that they are hoping for.) That's fykijoti's deal, apparently. I'd like it noted that fykijoti's from 91.63.115.108, which is Deutsche Telekom: it is always Germans.

As far as the reason they are dead, I don't know what happened. Maybe their host dropped them, maybe Cloudflare did, maybe the domain expired, or maybe it was an experiment to begin with. The admin was cagey when I told him he was going to have this problem if he didn't get a handle on the CP (AI-generated stuff is enough of a problem but they had actual photographs of children), I interpreted that to mean he intended to create the problem he created, but if this was another academic research paper, that could account for the evasiveness (although it doesn't preclude the possibility that the problems created were intentional).