Don't know what data caps are in your country, but if you max out one in Sweden (https://www.tele2.se/handla/mobilabonnemang/) 100GB, you can get it for quite affordable $40/month.
If you are using more than that on your mobile phone, something is wrong with you and not the data cap ;D
Agreed. I've got 4G at the moment and it's plenty fast, since I can only use it for moderate surfing/etc since I'd otherwise hit my monthly cap in a week. If I had super fast 5G, I could accidentally burn through my cap in a day.
I had a prepaid Telstra SIM in Australia. I speedtested 130 MBit/s on their LTE network. On prepaid, data costs a bit over AU$8/GB. So you can burn through 8 dollars in a minute.
I bet you could do it in a couple of seconds. I can easily reach my cap by watching HD Netflix on the train (sadly.. I'd love to do that :))
Data caps should go up as people move to more spectral efficient technologies. Even as carriers fight it, competition slowly makes data caps bigger.