I've been told all the various services like it do. But at least with iCloud your money supports Apple.
iCloud doesn't have anything to do with Match using cellular data.
I would say at least 80% of my data is used for iTunes match and when I was on unlimited data I would hit the 3gb cap every month, about 7 days before my billing cycle reset. I am now on a 10gb plan and we will see how it goes now with the iPhone 5.
So.. Streaming music uses lots of data?
Sorry if this is a repetitive or dumb question I am just confused, pardon my lack of knowledge in this area.