The prepaid reward card works like a credit or debit card. You can use it anywhere that credit is accepted as a payment type. So buy gas, eat out, whatever. It is not quite, but almost as good as cash back. I actually prefer this to getting a rebate check.
As far as the subscription... I have a work around. I've got a credit card that expires in December. Guess which card I'll be using to set up the subscription. No need to remember canceling in that case, they'll attempt to charge me in a year and won't have a valid card to bill against. I won't care, as the software is going to be installed on a VM running Windows 10 tech preview, which will be going away mid next year anyway.