Some gamers use Rock Paper Scissors to check timing and psychology-- do you go first, mirror relocations

https://rock-paper-scissors-gambling-game-n-j-x-t4-503.juniperbrief.com/posts/10-rock-paper-scissors-meetups-you-should-attend

Some gamers use Rock Paper Scissors to check timing and psychology-- do you go first, mirror moves, or all of a sudden switch strategies to confuse them?