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.
ref: https://github.com/hatari/hatari/blob/3bbaa031e59e25df17e15e79dd082945e0c132c6/readme.txt#L32