What influences the actual quantified number Trust Factor is based on hasn't been publicly released at all. Account age, number of games on your account, number of reports, number of games played etc could all affect it one way or another. One semi-confirmed factor is the number of games played recently, and whether or not you were reported within them. Even completely clean accounts can get low trust factor if they are reported many times and/or they have taken large breaks without any games played. I play CS completely clean, and my SMFC account (ESEA A player, played in Main League) decayed into a GN3 account after I took a long break from the game. I got back into the game and just demolished people as they were far lower rank than my skill level. After a week of doing that my trust factor became so low that I couldn't even queue with some old friends because the trust factor gap was too high.