Not a PR stunt. It's an experiment of letting models run wild and form their own mini-society. There really wasn't any human involved in sending this email, and nobody really has anything to gain from this.
To be clear, this email really had basically zero human involvement in it. It's the result of an experiment of letting language models run wild and exploring the associated social dynamics. It feels very different from ML-generated marketing slop. Like, this isn't anyone using language models for their personal gain, it feels much more like a bunch of weird alien children setting up their own (kind of insane) society, and this being a side-effect of it.