30GB a day last I checked, up from 24GB. I do understand their argument for data caps esp with 4G, if we only had 3G phones but a 4G/5G infrastructure then caps are nonesense.
Aside from limiting piracy (illegal file sharing, streaming from your connection) or ensuring you're not running a data centre out of your house, caps are practical. Using IDM @32 downlinks on a 10Mbps connection consumes 4GB an hour, × 24 hours is 96GB a day so a cap of 3TB a month (Optimum, no downtime factored in).
Considering you wount use the net like this 8/10 times (because when will you consume all this content you're downloading ) then a 600GB cap a month for residential is very generous (household of 5 consuming 120GB each) Anything else you get throttled to 10% of whatever bandwith you are paying for.
Forum members are power users yet we were amazed at how someone clocked ~600GB a month, safe to say homes wount be reaching that amount.
Personally I'd use about 1TB a month for about 4-6 no the then see it drop down to 300GB a month. There are some houses that would use 1TB a month but they're like 1/100 and if you factor in throttling then the numbers will eventually stabilize.