I stream all my content including using iptv, hardly download anything, and hit under 500GB a month.
It has a cap, but quite generous.
I no longer hoard media downloads, and only stream what I went when I want... No pre-grabbing every download I could source.
I notice as the years pass, my ISP speeds are going up, but my demand for that extra bandwidth has gone down. I use to do several 100 GBs on a 1.5mbps DSL connectio with Usenet running 24/7 ~20years ago (got banned by both local ISPs temporarily... Times before they started charging or not caring)
https://www.bell.ca/Bell_Internet/Products/Fibe-Internet-940...
Note the "included monthly usage" is unlimited. Unlimited is at least fairly unlimited - I burn over 5TB/mo sometimes (big nas and Plex server) and they have no problem with it. If you're willing to ditch the TV, check out some of the smaller time ISPs too, often good deals to be had there. Teksavvy is offering $89 for 250mbit unlimited.
I wouldn't download more data if I had 300 Mbps than if I had 25 Mbps. I would just not wait as long for it to download.