So I as a user am not allowed to get discounts on services by allowing companies to sell my data? If my information is mine, then I have a right to do with it

So I as a user am not allowed to get discounts on services by allowing companies to sell my data? If my information is mine, then I have a right to do with it what I want, including giving it to a company so they can then sell it. Just seems like you want to control how I am allowed to use my own data…