I'm not sure exactly what the legal framework is around it, but Canada's monopoly network operators (Rogers for coax, Bell for copper) are I believe required to sell bulk bandwidth to MVNO-style carriers. I've been a long-time TekSavvy customer, and certainly I get way better pricing from them than I would buying equivalent service directly from Rogers. And for what it's worth, when I tracert out of my house, the very first hop (9ms away) is a TekSavvy IP address which geolocates to a point in my neighbourhood, so it's not like I'm going through a ton of Rogers infrastructure to get to them (unless it's all transparent and extremely low latency).
There isn't much of a difference on the service side either; the trucks which come around here are all third party fulfillment firms regardless of who your ISP is (and they have super-bland, forgettable names like "Dependable HomeTech")