Well, I'd say the worst type of lie is the one that impacts your happiness and mental health directly. Like lying to yourself and being in unbeneficial relations/ marriage or abuse drugs etc. Ads just tend to create and emotion, a desire toward something (maybe not the best things like processed foods in McDonalds but not toward the worst of the worst - like creating intend to kill or something).

When ads just started in a way it destroyed some industries and create some. (Destroying and creating new working positions accordingly)

So yeah, maybe ai will destroy the demand in some people, but create request for people who will make those ai smarter, faster, safer etc.

It's a neverending evolution of society and economy. We gonna be fine!