In plain words, because that's the point of this whole site.
When you buy the book, Whop takes the payment inside its own secure form. Whop keeps your email address and the record that you bought, and I can see those. I never see your card details — they don't reach this site at all.
When you read the site, I use Microsoft Clarity to see how pages are used: which parts people read, where they get stuck, where a button doesn't work. It records the movements of a session so I can fix what's confusing. Anything you type is hidden from those recordings, including your personal link, and Clarity can't see inside Whop's payment form at all.
I don't sell your details. I don't share them with advertisers. I don't send you anything you didn't ask for.
Mine are small and do one job each. One keeps your books open on your device after you've bought, so you don't have to open your personal link every time. One remembers you've bought, so the top of the page can show "My books". One lasts only while you pay, so the book can open by itself when you're done. Clarity has its own, which only measure how the site is used, and Whop's payment form uses its own to check the payment is safe.
Write to jackcoleus@proton.me from the address you bought with, and I'll delete what I hold. If you're in California, that's your right under the CCPA, and it applies to everyone else here too.
Jack Cole is a pen name. Payments and receipts are handled by Whop, who appear on your statement.