> It seems a bit disingenuous but it’s common practice. Even the hyperscalers, who do have their own datacenters, include their colocation servers in the term “datacenter.”

I think you're conflating things.

Those hypothetical hyperscalers can advertise their availability zones and deployment regions, but they do not claim they built the data centers. They provide a service, but they do not make broad claims on how they built infrastructure.