The question is always what fair use is. Phone contracts with unlimited data set the fair use clause in Austria to 1.5TB a month and have no such limitation for data only sim cards (home use).

On the other hand unlimited in Germany often means ISDN speeds after 50GB.

I live in Switzerland and we have quite a lot of unlimited plans without speed limit after a certain amount of data. Also the price in relation to income is not that high. If I compare it to Germany, where you can get no real unlimited plan and very often have a bad signal even in cities, and also in relationship to the income there, Germany seems to earn a place much lower on the list. So this comparison seems a bit odd, and should be divided into prepaid plans with limited data packages and unlimited plans.

Fair use is loosely defined in most of Spanish ISP, and sometimes not enforced.

In reality it means "as long as you don't overload your nearest BTS very often and we get complains from other customers, you're good to go".

Not true. I have unlimited data in Germany for 40€/month and my fair use is 999GB.