I doubt they have those pipes, at least if every of their customers (or a sufficiently large amount) would actually make use of that.
Second question would be, how long they would allow you to utilize your broadband 24/7 at max capacity without canceling your subscription. Which leads back to the point the person I replied to was making: If you truly make use of what is promised, they cancel you. Hence it is not a faithful offer in the first place.
Not important here because backblaze only has to match the storage of your single device. Plus some extra versions but one year multiplied by upload speed is also a tractable amount.
Residential network access is oversold as everything else.
The only difference with storage is there’s a theoretical maximum on how much a single person can use.
But you could just as well limit backup upload speed for similar effect. Having something about fair use in ToS is really not that different.
Back in the late 1990s we could run a couple dozen 56k lines on a 1.544 Mbps backhaul. We could have those to the same extent today, but there’s still a ratio that works fine.
That sort of horrible abuse only happens in areas where some provider has strict monopoly, but that’s an aberration and with Starlink’s availability there’s an upper bound nowadays.