As the cost goes down to near-zero you can scale it up almost infinitely, especially if the profits are high enough to get some smart people working on the problem, which going by the article is already the case ("INTERPOL's finding that AI-enhanced fraud is four and a half times more profitable than the traditional kind"; incidents rose by 26% last year). If AI does succeed on mutilating white collar work enough there will be a large supply of knowledge workers that might just join International Scam Co. rather than have their families go homeless. Drowning man clutching at straw and all.
So if technologically it's impossible to prevent and societally it's impossible to prevent (like the attorney that got pwned same as the grandma), I'm not sure if there exists an answer that isn't worse than the thing it's supposed to prevent. I suppose we'll soon be in a situation where nothing we don't directly perceive in real life is provably true. That journalism and media in general seem to be in a deep crisis of trustworthiness means that you won't even get the benefit of the chain-of-trust as a proxy for whether something is or isn't real.
Ignoring everything happening outside of your immediate surroundings is a choice, and probably even good for people's mental health, but my gut feeling is that it does make humanity as a whole dumber and disempowered. What does corruption matter if nobody cares, or even hears about it? It was AI generated by $current_enemy anyway; nothing to see here, citizen.