Back in Mat5 they were shut down temporarily by the health department because of rodent issues, but reopened after they passed inspection. I'm guessing the issues came back or the negative publicity hurt their bottom line.
They were threatening to put KFC out of business. When the colonel came down, he was upset, so called in his calvary. There was an ensuing battle, and after the dust settled, Mr. Checkers decided to close shop and settle in the Adirondacks to live out the remainder of his years.
Rat droppings found in the restaurant. A video on the news showed it. When they had a inspection after the clean up, nobody trusted it again.
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