Of course you or I would never use it. And the general public has probably never even heard of WHOIS or CIRA. However, those who have some vague knowledge might think to try whois.ca before cira.ca. The general public probably goes to their registrar first, if they already have one, or google "how to register a domain" and wind up at google domains or godaddy...
That being said, I wouldn't mind owning whois.ca personally.