These numbers are flat out wrong, there's no way that the game uses '10 to 20 megabytes of data per hour' jpmorgan must have fucked that up somehow. I can't be bothered typing out the whole url referenced in (5) but that's just wrong.
And anyway, even if it were true, 10 MB/hr is nothing. That's 100 hours of playing until you reach 1 GB, which is the lowest cap I've ever heard of. Randomly browsing reddit will eat up a lot more than 10 MB/s if you're clicking on image links. Hell, there are individual gfys that are larger than 10 MB.
The thrust of the JPM piece was that there was no meaningful impact to data usage.