No data yet — it is guessing. Play a few rounds and it starts to learn your habits.
PICK A MOVE
Random guessing would be 33%. Watch what happens after 15 rounds.
What is actually happening: every move you play becomes training data. The AI stores which move you tend to make after each pair of moves, then plays the counter to its best guess. It never knows — it guesses with a confidence, and people are far less random than they think.