Cardly.net has been around a long time, originally listing an Australia address, then it switched to a Michigan address, then it very recently switched to a Toronto address.
It appears that someone knew that cardly.net was about to be bought by a Canadian, and that someone wisely bought cardly.ca and waited. And they didn't have to wait long either. Could have even been the cardly.net seller, wisely realizing the buyer was Canadian, and beat the buyer to the punch by buying the .ca too, kept their mouth shut so they didn't have to include it in the cardly.net deal, then anonymously sold it later.