Personally - I think this cuts both ways.

Things sold as "unlimited" are often much more expensive for the average user than proper rate based billing would be (see - mobile data, internet data in general, those soft drinks [incl a couple refills] etc...)

It's "nice" in that neither party explicitly needs to track usage (although to your point, the company almost always does actually monitor and track), and it can alleviate billing anxiety. But... I'm at the spot where I'd rather things like internet, phone, tokens, etc just cost their damn cost (ex - bill me at the actual costs your company incurs to provide the service, plus some markup).

This is a totally fair opinion to have, but I think it's a niche one. Most people want a predictable flat rate.

I've paid for cloud services at some non-trivial scale, and pricing them out becomes a big job. Understanding what you're going to pay month to month, how changing one part of your infra changes pricing, etc, is hard. I absolutely don't want to take that work into my personal life.