The Canadian government is paying for it in the sense that they're advancing the US federal government and Michigan the money that will be collected from tolls for using the new bridge. Canada will be paid back, as everyone agreed in the first place. Whatever I think of Moroun, he had very little to do with the necessity of doing that when this bridge was being proposed and planned in the mid 2010s, as Michigan had serious budget problems from the 2008 Great Recession.