Tim W (admin (and human))@ferrix you're absolutely right though that for remarketing ads in particular the advertiser would really like to get that signal and not spend on the wasted ad. The advertising middleman doesn't care and would rather not spend the effort (though, if they're charging for conversions it's in their interest as well since an uninterested customer will never convert).
It's a complicated marketplace for sure. Made more so by fragmentation and limited/no data sharing.
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