In practice UPC will probably have some kind of fair use policy buried in its terms of service - your best bet is to go through those terms and see what you find. Fair use typically means they will start throttling you beyond a certain point. Most ISPs keep this reasonably vague (e.g. if your usage is in excess of what they deem to be reasonable, but no actual data amounts defined).

Not all ISPs have a fair use policy though, and typically you're better off on large ISPs where your usage doesn't really stand out that much.

Wait, is there place where capped data on landline internet are a thing ? That said, I would expect that if you use it "professionally" they'll tell you to get a professional contract and not the cheap one ?

If they say unmetered they mean unmetered. You can check the fine print, for data reprioritizing rules.

Ultimately if it's unmetered, you can compute your maximum theoretical usage based on your actual speed. For example a 1gigbit port can transfer about 333TB each way.

https://www.omnicalculator.com/other/data-transfer

Edit: I see no language in UPS.ch around data limits so I imagine it's truly unlimited.

I use to work for an ISP and while there are things like unlimited plans, there would also be an Acceptable Use Policy. Where if you are using your service at 100% 24 hours a day we can bill you higher or throttle your speed if it starts effecting other people's service.

Check with your ISP if they have an Acceptable Use Policy and what penilties you may face.

If it says it's not data capped then it's going to really just depend on what speed you can get up/down.

I know Xfinity has a limit but I pay to have none. CenturyLink does not have a limit. So you may not have a limit. Google if your IP has a data cap.

I think this is one of those “ask for forgiveness, not permission” things. Unless you have no other options for internet, I wouldn’t stress