How do private operations servers exist since we can't rent operations servers?

Hello everyone,

I'm curious about how do private servers for operations exist since it doesn't seem like it is possible to rent a server for operations. A post from a community manager said it's not possible, but private operations server actually exist. Is there something special about the way that these private servers are set up that allows them to be able to start an operations server successfully? And how can I set up a server like them?

Any insights you could provide into this matter would be greatly appreciated. Thank you!