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Zero-click is eminently abusable: how many 402-returning iframes is one page allowed to embed? If the answer is finite, people who want to surf without paying can surf in an iframe. Ways to overcharge and ways to avoid payment would abound because you can't add access restrictions as an afterthought. Even a trusted-site model would allow for other sites embedding trusted paid content, and other "containment" problems. The only way to prevent abuse is to have the use confirm the payments, as only the user can judge whether they're accessing new content they want to pay for.