> you can proxy those through your own backend, but the ad company wouldn't trust this data as it would enable you to do ad fraud very easily The is only true

> you can proxy those through your own backend, but the ad company wouldn't trust this data as it would enable you to do ad fraud very easily The is only true for the actual showing of ads; data brokers and bidding services already often work this way. (Hell, some data brokers are nothing more than an Excel dump of their internal usage table they'll mail you for a fee.)