@SwiftOnSecurity Once upon a time, we had a subdomain .rw.<thing>.utoronto.ca, and we had software that used short names like '*.rw' for authorization, and we didn't notice that .rw had become a ccTLD.
And that is why people from Rwanda could read Usenet from our news server for a while.
('RW' was and is the abbreviation of a building name at the university.)