Yahoo can stick their fechen email where the sun don't shine. Ditched 'em years ago cos of all the ads and spam they generated. Nope, there's no way I'd ever go back to that. If something isn't ad/spam free, or can't be made to be, then I simply don't/won't use it.
I was recently referred to a site which demanded that I disabled Adblock in order to complete a purchase, and I figured "fech that, it's not happening", and went elsewhere instead. I refuse to do business under those terms.