Glad to see your on the right side of the fence but what I meant is that you cannot compare 'being charged twice for the same data' to 'being restricted from using your personal voice/data services to run a text based business or use as a business line'.
On tiered plans I don't think of it as paying for data twice rather being forced to buy a larger plan regardless of need. I knew what you were saying and both the items I posted would have been business use of your personal line. For that matter what if someone is tethering to host a web cam show that you must pay to view.
if those exist

IMO the ideal tiered plan would be pay per GB that allowed you to do what you like and pay for it

