Was wondering what the limits are on this service - turns out they quite sensibly restrict the number of shells allowed per source IP address. This script shows it starts refusing new SSH sessions after a few connections back to itself:

    #!/usr/bin/expect
    
    set timeout -1
    spawn torsocks ssh root@segfault.net
    while (true) {
        expect " password:"
        send "segfault\n"
        expect "\[~]"
        send "gsocket -s NzdlMWQxNGQM ssh root@segfault.net\n"
        expect "t\])? "
        send "yes\n"
    }

Eventually starts showing this in response:

    [ERROR]
    --> You (172.22.0.21) have to many servers running
    --> Read https://www.thc.org/segfault/youcheapfuck
    --> Contact us on Telegram: https://t.me/thorg
    Connection to 127.31.33.7 closed.

Also their Tor hidden service currently seems to be inaccessible. Perhaps there's a hard limit on the number of connections via that route, given that one can't restrict per any individual source due to the design of Tor.