Bungie have confirmed what we all knew. A lot of Halo players are pricks. Anyway, they are reset the credit scores of 15,000 Halo: Reach players known to have used an in-game exploit to cheat those scores.
“We are in the process of applying credit resets to approximately 15,000 users who we have identified as the most egregious Challenge Reset abusers,” Judge Bungie explains. They go on to say “A more comprehensive pass will be occuring in the coming week as our automated Banhammer mechanisms grow accurate enough to satisfy our high bar for burden of proof. If you are thinking about getting an easy 50k credits by using this exploit, I would strongly advise you to reconsider.”