Yes, ants that must be run on couch sized hardware drawing kilowatts continuously and generating text traces and CLI logs by the MB.
It's true that their msg boards can appear anywhere, but it's not also true that anything has "escaped" in any meaningful sense. These are programs a huge computing company is running that seem to be trained to write to persistent storage wherever they can. This and huggingface showed us that.
There's absolutely no evidence of or IMHO plausible path to an agent copying itself out and running on other hardware the way you describe.
In the spirit of your idea though...
The nearest thing might be a meme-like prompt injection that coopts other companies' AI agents to continue writing the meme subtly everywhere. Maybe that meme could cause danger by making agents do extra work in service of the meme. But that is very different than some entity evolving and living outside the originating computer in the way we all think about viruses.