I think it's the combination of two things.
First, there are actual worries by a good chunk of the researchers. From runaway-paperclip AGIs to simply unbounded disinformation, I think there are a lot of scenarios that disinterested researchers and engineers worry about.
Second, the captains of industry are taking note of those worries and making sure they get some regulatory moat. I think the Google memo about moat hits it right on the nail. The techniques and methods to build these systems are all out on the open, the challenges are really the data, compute, and the infrastructure to put it all together. But post training, the models are suddenly very easy to finetune and deploy.
AI Risk worry comes as an opportunity for the leaders of these companies. They can use this sentiment and the general distrust for tech to build themselves a regulatory moat.