Again, I'm in no way denying either that (1) exists or that there's almost certainly an AI bubble -- I just think this difference is material.
For example, I would classify the recently proposed deal between NVIDIA and OpenAI as a case of (1), but this deal between AMD and OpenAI as (2). Namely, because I think it's clear that the chips act as well as recent advancements by Chinese manufacturers are threatening to NVIDIA's market-leading position and OpenAI investigating new vendors suggests they have suddenly become concerned with reducing cost of goods. Indeed, if both the leading Chinese firms and OpenAI were shown to be able to work with other vendors without sacrificing speed to market it would materially impact NVIDIA's stock price. AMD, on the other hand, is not trying to subsidize an existing client, but convince a market leader to take a risk.
The NVIDIA deal, then, suggests to me that certain limits have been reached in the industry, while the AMD deal does not provide me with any further evidence as to the existence of a bubble.