In Finland not cellular even. You only pay for the theoretical max speed, but the data is unlimited (no throttling after a certain point or anything like that).
I'm not sure if that is correct but yes there is providers with Data Cap in Finland too... CenturyLink is one with these plans.
And you'd be wrong in this case. Does America even have data caps?
Is really Europe's countries not affected by data caps? Well doing a little research showed it seems not the case.
Of course you have the option to migrate to a internet provider or plan without data cap but it does exists and maybe it is not possible to migrate or the inconvenience is stronger to some.