My old university dorm internet was like that. There were 3 or 4 time zones per day, and only the few hours in the middle of the night were unlimited, otherwise

My old university dorm internet was like that. There were 3 or 4 time zones per day, and only the few hours in the middle of the night were unlimited, otherwise iirc 500GB/month, measured by double and iirc. even triple-counting during prime time and such. For some reasons they were rather oversubscribed, offering 1000BASE-T in the dorms (with some L2 crypto auth), but only had 10Gbit/s fiber uplink in a few dorms. Considering they already had active equipment on both sides, this shouldn't be much of a problem though.