No level of government has the time to play whack-a-mole.

Hence why the likely outcome of this is that any website that originates outside of Canada will just be blocked, unless the company agrees to maintaining 6 months of metadata in Canada. They can just tell the ISPs to block any traffic outside of Canada and have a whitelist.

Whatever data that comes into Canada will have its metadata stored in easily accessable data centres.

They managed to do this with the Great Firewall of China, so don’t think that it isn’t possible.