Unlimited data plans have been very cheap for several years now.
Not in Slashdot's home country.
In some more remote parts of the U.S., the only option for high-speed home Internet is satellite, and satellite doesn't have unmetered data during waking hours. In other remote parts, such as East Buchanan, Iowa, DSL is harshly metered as well.
Cellular carrier T-Mobile has introduced an unmetered plan, whose name reminds one of synthetic motor oil. But at $70 per month for the first of four lines on a plan, it's more expensive than metered plans, and it puts the subscriber at the back of QoS after using 25 GB in a month. Furthermore, in some parts of the U.S., Verizon is the only cellular carrier with adequate coverage, and Verizon has refused to offer unmetered plans.