Back in the day, pre-CIRA, .CA was managed according to rules which included the restriction that a single company was only allowed one domain name. So, to choose a company at random, General Motors Canada was welcome to GMC.CA but they couldn't also register PONTIAC.CA or GM.CA or GENERALMOTORS.CA.
for those of us who manage smaller cctlds pro bono, it is also good for our sanity, especially when paired with the requirement that the registrant be real and in-country. it also encourages the isps in-country to take over the cctld, which is good. they can charge a bit for the service and multiple name registrants become a good thing. e.g. nigeria is finally running their own internally, though we are not moving the visible primary and admin poc until it is past test phase. this is a long-awaited day. randy