Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
https://github.com/systemd/systemd/blob/6aa8d43ade72e24c9426e604f7fc4b7582b9db7c/NEWS#L72-L73
