That would still require a lot of equipment potentially but it's there.
Another possibility would be some kind of rogue agent scenario where the program and hide and distribute itself on many machines, and interact with people to get them to do bad things or give it money. I think someone already demonstrated one of the LLMs doing some kind of social engineering attack somewhere and getting the support agent to let them in. Not hard to imagine some kind of government funded weapon that scales up that kind of attack. Imagine whole social movements, terrorist groups, or religious cults run by an autonomous agent.