But that's an example of the opposite. Americans (and really, everyone in modern societies) might be used to assumed, hidden costs.
If we buy a thing for $10, we expect that to be a baseline, as we may pay tax or gratuity on top of that. If I go to the store and buy something for $9.99, my mental calculation is that it may actually cost $10.70 or so with tax. If I go to a restaurant and buy a $20 steak, my expectation is that will probably cost $25.
But if I go to a restaurant and order a steak and they serve me a soy burger, that will not be acceptable. An "unlimited" plan not, in fact, being unlimited is different than what you've described.
If we buy a thing for $10, we expect that to be a baseline, as we may pay tax or gratuity on top of that. If I go to the store and buy something for $9.99, my mental calculation is that it may actually cost $10.70 or so with tax. If I go to a restaurant and buy a $20 steak, my expectation is that will probably cost $25.
But if I go to a restaurant and order a steak and they serve me a soy burger, that will not be acceptable. An "unlimited" plan not, in fact, being unlimited is different than what you've described.