The parent post is a little hyperbolic, but ISPs are certainly willing to artificially limit capacity upgrades as a way to extract tolls from content providers. Remember the spat between Verizon and Level3/Netflix?

http://web.archive.org/web/20160405105037/http://blog.level3...

Both networks had plenty of capacity internally; the bottleneck was a single router at each interconnect location which Verizon refused to upgrade.