Isn't this a pretty common password setting? I know that for at least 35 years, and going back to the VAX/VMS days I've been locked out for X hours if I typed an invalid password. Same on Windows and I think also Linux (though ssh public keys and clients remembering passwords mean that rarely happens to me).
Not in the same way, no. There are tools/policies that will stop one from connecting endlessly from the same IP. Certainly on Linux, you can try over and over. Matter of fact, here's a random Linux test box I have on the internet, and logging in to root just gave me this message today:
Last login: Tue Dec 3 19:12:22 EST 2024 on pts/0
There were 79522 failed login attempts since the last successful login
