Allowing login without username with SSH

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So i recently stumbled upon a job application form that was entirely in SSH. You would SSH into their server and fill out their questions from there. The thing is tho, you didn’t have to enter a username when you logged in. From my understanding, if you don’t enter a username you’ll just automatically login to the same username that you’re currently logged in as on your physical computer. But how then can you log into the remote computer? They can’t have every possible user on there so how does it work?

Oh yeah here’s the command btw:

ssh join.5monkeys.se

I’ve searched a while but I didn’t find an answer. All help is much appriciated!

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