This is an interesting point you make. But didn't we solve all of these context issues already? I don't remember getting any ads like his in Duckduckgo since I'

This is an interesting point you make. But didn't we solve all of these context issues already? I don't remember getting any ads like his in Duckduckgo since I've started using it. Nor do for the ads we used to get when everybody used contextual ads. The only issue is going to be that you will have to handle this when you implement ads for your website/app. And each of them will have to do it.