a lot of signups from subdomains of io.vn

is that a real place to get an email address? seems to probably be spammers.

#mastoadmin

@stefan .VN is the TLD for Vietnam, so I don't expect that people from around here would be signing up there unless they were looking for a disposable address. And I vaguely remember some article on cybersec that called out Vietnam as home to a bunch of big botnets.