I'm not sure what any of this has to do with the math. You claim 128GB over a 50Mb connection. That's less than six hours of constant streaming. Unless you want to qualify it with "during the times AT&T actually provided reliable service," your numbers seem off. A lot.
Maybe I wasn't clear (sorry). At the end of my testing after using 128GB (end of the month), I did the speed test to check if I was throttled.
And just because my ipad was capable of that high DL speed, my hosting server that I was constantly streaming HD movies from, isn't capable of that upload throughput (50Mbps uploading).
You're assuming that streaming video can provide data at the same rate as speedtest. In reality those numbers are nowhere close, and don't reflect the reliability of AT&T's service.
No, but the topic was network testing more than anything realistic. I missed the point, essentially. YouTube does have some 4K video though, which probably does hit that sort of bitrate.
10 Mbps is a good estimate considering modern video codecs, but it's not the upper bound. 1080p video at 32bpp and 60 fps could use as much as 3 Gbps, depending on the compression.
The image for the speed test was to see if they throttled at the end of the month.
Just to be clear...don't try this on a supposedly Unlimited iphone data plan, or straight talk unlimited...doesn't work lol.