Where is the evidence for this claim? Many people, going back the previous version of the Ritz Carlton card, took advantage of Chase's incorrect interpretation of the rule, and I do not recall any report of a closure that Chase attributed to this choice.
As many have already said, a bank will not give you the exact reason but a more generalize one. Avoiding the AF falls under unsatisfactory relationship. In your case, they decided to go with too many accounts open. Keep in mind that many people get deny a card for opening too many accounts, but a full shutdown involves more than that.