Creating disinformation is low effort and low skill, and you can hire people to do it for very little money. Simply producing disinformation at scale is not worrying; bad actors already have all the scale they could ever want.

What would be worrying would be an AI that could craft especially viral disinformation. That is, an algorithm that could model what it is about pizzagate, vaccines and autism, etc. which makes them so contagious, and then design a campaign intended to achieve a specific goal rather than just sowing chaos. I don’t think we’re very close to that technology, and I don’t know of any research that even hints in that direction.