Small update: I didn't get any reaction (so far). The post in their about community has zero votes or interactions. I've then escalated things and filed a bug report on the bot's project page. Also with no reply in the last 3 days. So I guess either they're busy with other stuff and their "bridge" bot is practically unsupervised... Or they don't care... So I'd say your gut feeling was correct. I'll give them some more time, 9 or 3 days isn't a lot for a hobby side-project... But I think at some point, Fediverse admins might want to think about de-federating and effectively shunning them, if it turns out that instance is effectively unmoderated and pulls in problematic content, and isn't even liked by a good part of the user base here.

Kind of a bummer to be honest.