I contacted VZW Customer Care, and asked the same question, and was told to download the Go90 app. I was informed by VZW Customer Service that videos and content viewed through the Go90 app DID NOT count against you monthly data usage. I later found out, through the VZW Go90 FAQ's that it does in fact count against your data usage.
https://www.verizonwireless.com/support/go90-faqs/
So, hopefully somebody here can answer the question more honestly?
I ask because I am currently on a 20GB plan, and need to reduce my bill. Data is killing my cost. I've looked at alternatives like getting a hotspot through another carrier that would cost $35 a month for 6GB of data, AND it offers unlimited streaming of music and video through services like iheartradio, slacker, Samsung Milk Music, pandora, siriusXM, netflix, hulu, etc. It's actually a really good deal- and truth is, I could save 70 bucks on my data on VZW and get an 18GB plan on a wifi hotspot that is actually cheaper.
So, there's the scenario, and I gotta say - I don't know why VZW isn't partnered with some music streaming services that might help customers with their data plan usage.