It seems easier to register in infosec.pub than on sh.itjust.works, I just did it and there’s not even a captcha. It might have more to do with the server problems and what it may be doing to other instances. Or it might just be that time of the year again,

Happened three months ago: https://infosec.pub/post/2137743

Happened five months ago: https://infosec.pub/post/600368

There’s a lot of vague accusations, but it’s hard finding evidence, perhaps because of the nature of it.