In plain words, because that's the point of this whole site.
When you buy the book, Whop takes the payment and gives me your email address and the fact that you bought. 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 key.
I don't sell your details. I don't share them with advertisers. I don't send you anything you didn't ask for.
Two kinds. One remembers that you've entered your key, so the book stays open on your device — without it you'd type the code every time. The other belongs to Clarity, and only measures how the site is used.
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.