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Why he said 0day not valid user?

I create '0day' user on my computer without problem (Fedora 26 Beta, Debian 9)

useradd 0day $ id 0day uid=1003(0day) gid=1003(0day) groups=1003(0day)

In the thread someone mentions that adduser won't allow that.

That aspect of adduser, at least on my system, is explicitly configurable via /etc/adduser.conf .

I don't think systemd (which is after all attempting to be universally deployed) is entitled to assume that the system administrator hasn't changed the default.

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