My ISP (Virgin Media on cable) throttle if you exceed fair usage thresholds in a day. They used to anyway. But the limit is fairly high and you had to download several Gb within a particular period to trigger this. And then it would reset a few hours later.
And before anyone wonders how I occasionally tripped this legally, the DVD images for software I use for work are often 4Gb+ and there's more than one to download.
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