Earlier quoted context omitted.
I'd be curious to know why you would prefer a metered approach when, as you say, for that same price you get uncapped. It seems to me that most people, in the US anyway, would rather not have caps. I can honestly say this is the first time I've heard anybody say they would, for the same price, prefer a cap. For the record, 20Mbps for £20 is roughly similar to what our local cable monopoly offers in NC.
I absolutely prefer capped service far, far more than uncapped services. In Singapore, I can get a LTE SIM for $35, and then pay $25 for 7 days of data @14 Gigabytes, with roll over of the amounts I don't use. In general, I get 50 megabits down/20 megabits up. And, because this is a capped service, I have a reasonably good chance of actually seeing that performance. If it was, "Uncapped" or "Unlimited" - then people…
Using the service I have paid for is not abusing it, anymore than watching too much cable TV or making too many local calls is abuse of those services. If it causes degradation for other users, that's the fault of the ISP that has over-overprovisioned us. And the top ISPs all have profits in the billion dollar range, so it's not like they're hurting for money and just can't fix the infrastructure. Caps are just a way to squeeze out higher profits by reducing the necessity of upgrading infrastructure.
That said, not once have I ever seen my speeds drop below what they're rated to be.