Total dystopian thought, but I wonder if this could ever be used to extract info people unwillingly, as in some interrogation scenario. I mean, you have a lot more control over what you say than what you think.
Most likely the brain implement is working against/with a persons consciousness. This "information extraction" device you talk about, would need to work against/with the sub-consciousness, otherwise you can just think "WALL WALL WALL WALL WALL" and the device would only be able to extract that.
Not to say that this device was probably trained on the person a lot before they could reach that accuracy. A "information extraction" device would have to be trained on it's victim first, but why would they play along with the training?
Maybe I'm wrong, but I think most people have control over what they consciously think, at least it works like that for me.
If you read the article it's clear that the researchers aren't pulling out the information from the guy's thoughts, they're reading the nerve signals from him "imagining" he's writing a letter, and using ML to map that to pen strokes which get mapped to words.
So if James Bond gets captured, all he has to do is to not imagine writing the information, he can think it all he wants.
Perhaps someday. It seems the way this experiment worked was by "imagining writing the words by hand", which would indicate that this kind of transmission was dependent on an explicit act of will.
