So far from my personal experience, 7 out of 10 people have a modded weapon. It could be more, it could be less, but as soon as those people join, they start blasting away with their modded weapons (usually dark and orange) with rapid fire.
If they're going to ban people who has a modded weapon, that'll probably be a HUGE pool of people. I doubt people really are going to get banned in this non-competitive, non-server based shooter/rpg game.