There's a couple of things. First, the bans prevent players from playing regardless of where the ban was issued. Tipping the scale from more bans from web reports to more bans in-game isn't going to change the overall rate of bans issued in the short term.
Second, while there's a lot of incidents that are unfortunately missed, the vast majority do follow the rules so you're unlikely to notice an impact on the concurrent players regardless of what happens with punishments. It's easy to forget that most people don't even drive on C-D at any given time (right now it's about 28% of players on Sim 1).