In my experience? Yes, with a few caveats. Internet Mafia can exacerbate a number of negative traits, including over-dramatization, paranoia, and straight-up narcissism. It encourages people to create fake versions of themselves and then project that facade onto others, leading to an atmosphere of mistrust and misleading behavior even outside of games. In my own past, I've seen that manifest itself in a lot of ways: People who automatically leap to the worst conclusions about others, players who compulsively lie about things completely unrelated to games, and moderators who tell deliberate untruths because they think they can control the real-world narrative. Mafia just seems to draw a lot of individuals who are emotionally insecure, unempathetic, power-hungry, recklessly escapist, or overconfident in their ability to understand and control others. I'm speaking as someone who has been all of those things in the past. Getting into Mafia stunted me emotionally in some very unpredictable ways.