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What are the downsides of kickback? If it's just about getting a discount when using less than 2GB/mo why would someone choose not to opt-in? Why isn't it automatically applied to all customers? It sounds like you're probably giving something up when you opt-in to kickback.
Nothing is given up. I have 2 lines. Both opted in. My line always goes over. My 2nd line sometimes stays under 2GB and gets $10 credit. No downside.