I already answered your question...you must connect to a computer to use spirit, you cannot do it from your iPad. Also, you cannot use a legit copy of windows without it sending information to Microsoft. So as much as I am anti apple and pro windows, your statement isn't exactly true. Yes you don't h ave to give an email address but if you're that paranoid create a hotmail account and never log into it again. Call it email@example.com. It's not like you have to give them your main email. And downloading apps through cydia sometime requires a login and payments well. As for iTunes you can select none to give them no credit card.
I understand your concern but that's just life. How many things can you buy on the Internet these days without making an account? I'd be willing to guess that every two out of three online companies that I try to buy from make me sign up, or at least provide an email as a requirement to order. And a big company like apple isn't going to spam you or sell your email.
The only way to sign up for an itunes account and provide no creditcard info (not well known) is to:
install iTunes on the PC.
Go to the app store and choose to download a FREE app.(app must be free)
when prompted for your itunes account login select the option to create a new account.
While signing up for a new account you will get to the section asking you to enter your payment method. Since you originaly were trying to download a FREE app it will give you the option to select NONE.