I think that this is one of the main reasons that it is harder than it should be to convince average people in the US, especially on the political right, that we need net neutrality.
Take the plan I'm on with T-Mobile. I pay a fixed monthly amount and get 3 GB of data per month. If I go over 3 GB, T-Mobile reserves the right to give me lower speed for the rest of the month.
T-Mobile has a thing called "Music Freedom". Under Music Freedom, they zero rate around 45 streaming services.
Look at this from my point of view as a consumer. I signed up for 3 GB of full speed data a month, and I get that. There is never a situation due to Music Freedom's zero rating where I find myself short on data and think "dammit...I could have downloaded this if it weren't for that zero rating!".
All that Music Freedom does from my consumer standpoint is make it so sometimes I get more than the 3 GB my plan entitles me to.
Compare this to throttling and blocking. With throttling and blocking if T-Mobile were, say, throttling Skype or blocking it, then I could find myself saying "dammit...I paid for this and they are not giving it to me!".
In the Music Freedom case, they give me all I paid for and they toss some free extra on top. In blocking/throttling, they interfere with me using what I paid for. From a consumer point of view equating these two as net neutrality advocates do just seems odd on the face of it.
If we keep net neutrality focused just on making sure that we get the data we pay for, free of blocking and throttling, and if the ISP wants to give people extras on top of that let them, and I think net neutrality would then have near universal strong support among consumers, maybe even sufficient to get laws through Congress.
But what about the actual potential harms to competition from zero rating, which is one of the main points brought up in favor of covering it under net neutrality?
We can deal with that without shoving it into net neutrality. We already have a whole legal framework and associated regulatory infrastructure in place to deal with that: antitrust. We can use that to distinguish between the kind of zero rating this is probably good for consumers (Music Freedom) and the kind that is not (ISP zero rating just their own streaming service).