Earlier quoted context omitted.
That’s not how anything in the consumer world works. If you want guaranteed volume and throughput, sign a contract for it.
You appear to be projecting your experiences in your country as "the consumer world". For example, Australia: https://www.gizmodo.com.au/2022/06/spintel-acma-unlimited-si...
ISPs in Australia regularly sell 'unlimited' connections that aren't unlimited, and ACMA allows it. [1]
I'm surprised my own residential grade connection hasn't been flagged, given I consume over 10TB a month.
[1] https://old.reddit.com/r/nbn/comments/hwz7l4/abb_cancels_ser...