Are you sure it was fake scarcity for Gmail? IIRC they did it because they were worried about systems falling over if it grew too fast, and discovered the marketing benefits as a side effect.
I didn't. Anthropic and others followed the concept of scaling up models and worry about efficiency and availability later. Sam likely didn't invent the idea but he talked about it.
In the case of Anthropic is fake availability.
Sam Altman explained the idea is to scale the thing up, and see what happens.
He hadn't claimed to offer a solution to the supply problem that would unfold.