And it’s likely we won’t get an explanation. The admin closed their donation accounts too. Looks like they either walked away or got seriously hacked. It seems they were worried about illegal material on their server, which was on their own machine at home, so walking away would make a lot of sense.
They had a pure open federation model, so anyone who subscribed to an instance that hosts child porn put the instance owner at risk of child porn possession charges. I wonder if the owner came across a problem file that was cached from an external server and said "Nope. Dealing with this is above my pay grade"