If a website uses targeted ads and track users, they won't use the PPA feature Mozilla introduces here. So the setting won't affect user. On the other hand, if

If a website uses targeted ads and track users, they won't use the PPA feature Mozilla introduces here. So the setting won't affect user. On the other hand, if a website is not evil and willing to sacrifice revenue for better user privacy, and use non-targeted ads, PPA gives them tool to do so. In contrast, the current adblocking methods are blunt forces. They don't distinguish the nature of specific ads.