Please see the emails and direct mentions sent by iftas.org on Jan 16, Feb 5, and I'll send another one today.
I am also performing free work. So are all the Fediverse admins you federate with.
I understand maintaining a Mastodon server is hard work. I strongly suggest you disable new account creation or only allow it with review and approval.
As far as I can tell, you are the only active human on the service.
