Yahoo restricting Mail accounts if it detects ad-blockers

Perhaps this is the validating proof that commerce on the Internet has finally matured. There is a disruptive technology (ad-blocking) that is an existential threat to some of the largest companies on the web (Google, Yahoo, Facebook, et al.), and their reaction to date, by and large, has been to try to kill the technology. The kind of move a stodgy corporation would make.