> Even if I had the hardware, as a pure software person, I have no clue how I'd even start setting up a physical location to serve data on that scale.

3TB/day is about a third of what you can serve out of any run of the mill PC with a gigabit ethernet connection. There are 22TB drives and individual servers with 24 drive bays, which exceeds 500TB. So you could do this with one machine connected to a gigabit fiber connection, and the machine would cost approximately what they're paying monthly (almost all of that for the drives).

In practice a 24-bay chassis is silly and you might use a separate storage array etc., but that's just details.

> Plus, even if you deal with the storage itself, how do you deal with serving the traffic globally?

At 3TB/day you're not Netflix. Just serve it directly from your own server.