I think they have realized that even if OpenAI is first, it won't last long so really its just compute at scale, which is something they already do themselves.
There is no moat in models (OpenAI). There is a moat in infra (hyperscalers, Azure, CoreWeave). There is a moat in compute platform (Nvidia, Cuda). Maybe there's a moat with good execution and product, but it isn't showing yet. We haven't seen real break out successes. (I don't think you can call ChatGPT a product. It has zero switching cost.)
If anyone has moat related to Gen AI, I would say it is the data(Google, Meta).