I’ve had Verizon for several years and don’t recall receiving any alerts (Amber, from Obummer, etc.)
Presidential alerts have been defined as part of the Emergency Broadcast Service for 17 years, and not one has ever been issued.
As for amber alerts, Verizon may have disabled the feature by default (AT&T enables it by default) or you haven’t had one in your area since your phone was updated.
I have an iPhone 4s with Verizon. Within the last several months I have received one Amber Alert and 2 storm warnings - one was a blizzard warning. I don’t have any problem with receiving these messages, but I do not want ANYTHING from Obama.