They don’t have my email address. Or I should say, they have my junk mail email address. They also don’t have my mailing address. I think it has changed at least 2 times since I signed up for the <service>. Alas, they do have my phone number which may account for some of the telemarketing calls. But you are correct, they are privy to a whole lot of information to which they are not entitled under normal circumstances. But they have created the circumstances that penalize me if I don’t sign up for the <service>. Like I said, legalized extortion.
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More importantly for the store and its corporation, they have your name, address, phone number, and email address. And they can sell that information to who-knows-who-else.