About 250 turns into a game (I rarely last that long), 2 carbon-based enemies left. My tactic was to build spies and shut down their shipbuilding. Surprisingly, the AI never countered with any spies. I looked with console, they both had researched Espionage, but after 50 turns, they offered no response.
I thought the AI was developed enough to at least counter my spies. Is this a fluke? Have people seen the AI use Espionage?