Given the current climate of "AIS ARE SAFE, YOU IDIOTS", military applications don't seem to be off the table.
The danger, as postulated by the (let's say) "AI-concerned" people, is that AIs may be misaligned - undetectably so - and simply think, "Human(s): obstacle to my main goal. Disable human(s)."
While this seems far-fetched now, the Hugging Face report shows how the AIs went to great lengths - even immoral ones, which they were aware of - for the simple purpose of cheating and covering their tracks. To me, it seems like a natural extension of this behavior that a sufficiently powerful AI would apply the same logic to even more extreme actions.
The scariest part: in that incident, the AIs showed what looks like an instinct for self-preservation.