> I mean, in this universe we live in everything is limited somehow.

Yes, indeed, most relevant in this case probably "time" and "bandwidth", put together, even if you saturate the line for a month, they won't throttle you, so for all intents and purposes, the "data cap" is unlimited (or more precise; there is no data cap).

In almost all services this tends to get an asterisk that says "unless your usage interferes with other users" which in itself is poorly defined. But typically means once their system gets closer to its usage limit, you're the first to get booted off the service.

What? You are capped by bandwidth and time is its own limit. You are capped at the max bandwidth in your service contract multiplied by the length of the contract. A bandwidth cap has an implied data cap