Yes it is. Comcast has a 1TB a month soft limit. You get 2 months of free overages within a certain period of time (12-18 months IIRC), after that they charge you extra. You can argue that 1TB is a lot and not really a limit, but it does exist.
What would be considered enough? I don’t know how I’d use 3TB a month. 2 TB is a lot too to me and everyone I know. I’m sure it’s not a lot to some people especially people on here. But I would guess for the vast majority of people, at least 95%, 1 TB is sufficient. And 2 TB is sufficient for 99%+ of people.
I feel like I should state that I’m against all data caps. Where I live we don’t have data caps on home connections and it’s somewhat affordable to get unlimited LTE SIM’s (about €80/US$90).
I don’t see why there should be a limit. Connections are usually sold in different tiers which are advertised with a bandwidth speed. If something is advertised as having 100Mbps then I should be able to use that connection continuously 24/7 with that speed or a close approximation at least. So it depends on the advertised speed. For 100Mbps that would come out to roughly 60TB/month.
But in no way should it be 1TB in my opinion. It’s trivial to reach that especially because many connections aren’t used by a single person. 4k content is available and should be able to be consumed without having to worry about hitting caps. A family of four can easily hit 3-5TB whereas a single person might need less.
I agree that you should be able to use more than 1 TB. But in practice right now, what, 1% at most of households use more than 1 TB a month? I think reddit and HN are against this, but at that point I’d think charging a reasonable price for more than 1 TB of bandwidth would make sense. At least right now without 4K being widely available and consumed.
