Some P3s are.
In the Canada infrastructure bank model, you're attracting additional private sector investment into the asset to take on the risk in the revenue part. The extent to which a project may be riskier is the extent to which there is risk to be managed around the revenue or business model of that project, which is what the infrastructure bank is transparently designed to do: match up the risk with a private sector investor who is willing to buy the risk, with the infrastructure bank coming in no more than necessary to manage the risk transfer between the two parties. They're quite clear and distinct.