I never get why when a company offers some optional plan that people get so up in arms about it.
This plan existing at all, optional or not, is a blow to net neutrality, which is what is upsetting people, not the plan's details, price, value, etc. Basically, with net neutrality, every Internet provider is supposed to provide equal access to every web site. It's a big reason why our Internet has been the way it is (basically open and freely accessible) for so long.
Internet providers have lately been trying to get around net neutrality in little ways,
leading to discouraging pictures bleakly predicting the future like this one (which archeon_xl posted above).
As of late, Internet providers (at least the land line ones) unfortunately started to throttle certain web sites, like Netflix and YouTube, which is against net neutrality. Netflix added fuel to the fire by actually paying off those companies to get equal access.
Also unfortunate is that mobile companies are doing this too, and much more blatantly. T-Mobile is offering free Internet access for a special selection of music streaming services, promoting it as a good thing. Sprint is now offering this deal here, which is
exactly what that discouraging picture above predicted. (That picture was actually my very first thought when I saw the thread title.)
I do understand the frustration with people complaining about optional features, but this here isn't about that. It's about the threat to net neutrality and the possibility that this kind of thing will become commonplace.