The obvious question here is why does anyone "need" Yahoo? I have had Yahoo blocked in my Hosts file for at least 12 years. They are the worst of trackers and I chose long ago to take a political stance on creeps like them. Fellow creeps like AT&T that I have been told use Yahoo for their subscribers email client were able to do this because not enough people stood up and said "No, I won't take it anymore" to AT&T's laziness and greed in refusing to provide users with a proper email service not tied to a super spyer.
I don't particularly want an ISP deciding that all ads are blocked but isn't that better than the prostitution that is so widespread among users? Why haven't users enmass killed Yahoo's terrible privacy stance by boycotting the site? If it takes a courageous ISP to wake people up ...so be it. Of course, people may be so far gone into their addiction to sites like Yahoo that nothing will save the internet or most humans.
When governments fear people, there is liberty. When the people fear the government, there is tyranny. Thomas Jefferson