i think the curve moves like the (a) in the picture when productivity increases

When I'm talking about learning curves, I'm talking in the economic sense, like this:
https://galepooley.substack.com/p/how-learning-inverts-the-supply-curve
When people find a broken , probably unfair strategy in certain game, they begin to harness them in new emergent ways, just like when a profitable product is "improved" through massive repetitive production and learning things about it
I consider this one of the forces that drives a significant part of the players to play a game in the first place. Suddenly cutting the while strategy could provoke an exodus of the participants and be counterproductive for people generating ideas while playing the game. I consider a great advantage that AI could take all ideas as vectors and could find ways to "cut in half" the broken mechanic. People could keep learning about them and the Bad effects of the evil mechanic could be mitigated because (I guess) there aren't infinitely extended exponential learning curves in the world (eventually the profit potential could be exhausted)
i think the curve moves like the (a) in the picture when productivity increases

Yeah, that improves the productivity (supply) of certain product. The thing is that people are also incentivized to produce for a profit. If people have so much demand for a product, its price will drop pretty quickly (in a standard of law of supply and demand, free market, of course) and the producers will eventually be incentivized to produce other things because the opportunity cost of doing that will be more favorable