Automated tooling has now been installed on #MstdnParty and #MstdnPlus to address reports of #spam from and to the instances.

For other #MastoAdmin's: all accounts use gmail addresses. One IP is 89.163.206.181 (German VPS) and the other is 122.165.217.244 (Indian fixed-line); it's unclear what pattern there is to actually prevent this attack.

I do want to address a few more things. I strongly prefer automated tooling over conditional registrations. I believe many (including me!) would stress out on any application-like questionnaire, even if it's just one question. This is also a general instance and it's difficult to evaluate people's responses other than blindly approving them.
I'd also like to object to the framing of general instances (and their administrators) by certain other instance administrators and people who report spam. Many know that Mastodon lacks moderation tooling, but it's not entirely missing: webhooks and admin APIs do exist. It is important to work towards moderation tooling - be it advocating for changes in Mastodon or building tools around it - instead of pointing fingers at fellow administrators.
@austin If I'm totally honest, the way that some elements of the fediverse sometimes reacts to developers who create such automated tools makes it frankly a frightening proposition.