Questions

Does this cost anything?

No. There's nothing to buy, ever.

I didn't get a code.

Amazon sometimes asks you to approve the sign-in in the Amazon app instead. Approve it there and the page carries on.

How do I remove my data?

Go to Privacy and tap Start over. Everything in your login is deleted, and it leaves every brand's counts.

Does it work on Android?

The link works in any phone browser.