Why can't you fake remote attestation? I imagine it's a bit more involved than swapping a user agent but is there some magic mechanism that makes it impossible to spoof?
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I don't know. There have been farms of iPhones overseas, connected over residential-exiting VPNs in the USA, with warm iCloud accounts, for ages. There is nothing magical about having to own an iPhone in order to bot farm.
Giant social media companies are reacting to slowing growth & customer concerns in the ad market, they don't have a secret forward-looking agenda but a backward looking one that has a lot of diffuse agitations. This can reduce the perception of click fraud, even if it doesn't do much about it in reality.