Started in the 1950s with the dawn of consumer credit. Mis selling that to buyers was highly profitable and everywhere. Really shook people’s trust. The dawn of the salesman.

Before that it was merely single low trust events. Scandals type. Lead in paint style.

That is not really true, at least from the "global history" point of view.

Sovereigns would debase coins routinely. Scammers would sell snake oil medicine in every village, then disappear. The Church would sell absolutions. All sorts of fake goods flooded the markets, from wine to guano. Bubbles like the South Sea Bubble devastated entire economies. Arguably the Ancient Régime in France was fatally weakened by too many such scandals on its watch.

Quite a lot of the current regulatory framework is a reaction to the ubiquity of scams in history.