I've been running RPI-based torrent client 24/7 in several countries and never experienced that. Eats a few TBs per month, not the full line, but pretty decent amount. I guess it really depends on the country.

I'm in the UK with Virgin Media on their 1Gbps package, going through multiple TB a month and I'm yet to be throttled in any way.

Well, multiple TB isn't close to your bandwidth rating. It only takes 2% of your connection in a single direction to hit 6TB a month.

Ha, yes I suppose that's correct.