Maybe the US law enforcement is tougher than their Canadian counterpart, but I am asking more from a demographic perspective. One of the prime reasons why the US mob went extinction is that no enough Italian immigrants while the Italian Americans are more and more Americanized, thus the old mafia culture no longer appeals to them.
I think the same thing could apply to Italian Canadians, so I wonder where do mob families in Canada recruit new members? In Ontario, it seems most mafia groups are closely connected to Italian Ndrangheta, so I guess a lot of the top figures are Calabrians who moved to Canada and expanded their territories to the new continent. But do they recruit from the local Italian population or do they bring people from Italy? If they have to rely on the local population then they will eventually face the same problem that destroyed the US mob I guess.