1. Scammers
Truth be told, I don't personally care if people want to hack their own game to gain fake achievements or fake skill levels or whatnot. It is ultimately sad though. A big part of playing games is to get all those things through your own effort. Every gamer knows this. Yes, I can understand the fun of cheat codes and playing with almost invincible stats, but to then use that online? That is sad. Even worst, these scammers don't tend to be that good at the various game modes to begin with. So, at times, you'll get friend invites from people who at first seem to just want to play the game, but eventually they'll ask you about your stats or your Ultimate Team and so on. Ultimately hoping you'll provide a copy of your own game-work to them (from a save file). Nothing breaks the 'fun' status of games like people who take things way too seriously. Resorting to cheats and hacks and scams to get by. If you can't be bothered to level-up or grind, then maybe that game mode just isn't for you.