I just logged into my all-but-abandoned yahoo account's webmail in Chrome with Ghostery set to block all, then in Chrome again but with AdBlock at default setti

I just logged into my all-but-abandoned yahoo account's webmail in Chrome with Ghostery set to block all, then in Chrome again but with AdBlock at default settings (and Ghostery disabled), then in Safari with uBlock (my default) and none of the sessions prevented me from seeing my mail. In fact, Ghostery and AdBlock in Chrome still displayed a Yahoo sponsored ad at the top of the list of unread messages much like GMail's top-ad. uBlock did not show that Ad. I call false on this claim, but the sample size here is beyond insufficient to draw a wide conclusion.