It's not super clear to me what harms you've identified here. Tracking mouse movements is a very common way to separate human users from automated fraud, and tracking page views is a relatively common way of identifying normal navigation of a website (homepage-->click on link to search-->click on search results-->click on product reviews-->click on buy) vs fraud navigation (open product page directly-->click on buy). This kind of anti-fraud has existed since the Silvertail days.

Additionally, the Stripe cookie can reasonably be read as a way to reduce false positives: if you've purchased from a dozen stripe merchants with no chargebacks and they see you in the same browser with the same payment method, you're probably good to go. The user benefits from having fewer charges declined, and from their goods being less expensive (due to lower shrink for their merchant).

One great thing about Stripe is their extraordinary transparency. The fact that the stripe.js payload is sent in ~cleartext is either a sign that their eng team was unwilling to roll their own encryption, didn't feel it was necessary, or consciously chose to make it visible so curious users can understand what's going on. I suspect their fraud solution doesn't rely on these being unobserved by bad guys. I am surprised that it's not necessary to include some tamper-evident field though.

For what it's worth, a post to login to aa.com includes this spectacularly obscured blob of who knows what. Would be interesting to know how much of my personal data got hoovered up here, but you won't get clickbait upvotes on HN by going after someone _less_ reputable than Stripe.

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