Now that Obama administration has curtailed banks' abilities to charge overdraft penalties and transaction fees, they're hunting around for new ways to make money off customers. One trick: automatically removing credit limits from accounts and making the change opt-out only.

Via DailyFinance.com:

No preset limit means no warning from our bank that you're overspending your means. It also means that you have no clear idea when Chase will say you've hit your limit. Some card users have reported an issue in which the lack of a spending limit means your available credit looks lower to reporting agencies like Experian, which can hurt your credit score. (Chase has responded to this claim that it "report[s] credit access lines to credit bureaus in the exact same way we report credit limits/credit lines to the credit bureaus.") And any charges that exceed your old credit limit come due in the next billing cycle, making this limitless card not quite the convenience it appears at first glance.