Yes and no. They don't use the kind of co-location services you might be thinking about. Co-location targets the corporate world. Corporate world loves it to j

Yes and no. They don't use the kind of co-location services you might be thinking about. Co-location targets the corporate world. Corporate world loves it to just hand off the servers and have it run for them. But if you go to a company such as Interxion/Digital Realities, they will just send you away (or more specifically, send you to one of their tenants that offers co-location services), because they are primarily real estate companies. They rent out empty rooms designed to be used for servers and even office space on their campuses. These are normal lease agreements and their purpose is that you put your own staff and infrastructure there. And that's what most mid-sized to large cloud providers actually use. They wouldn't even have the employees to touch servers or network equipment. What they take care of is ensuring that the AC is working, that the shared Diesel aggregates are ready in case of a power outage and that there is security personal patrolling the campus, but they won't enter rooms rented out to customers just like you wouldn't expect your landlord to go into your flat. (Equinix is a bit special on that point, since they offer both. You can get co-location too through Equinix, but it's probably not what AWS, GCP or Azure is using.)