A majority of debrands are because their contract ran out with the old brand and a different brand either gave them a better deal or they switched for some other reason. A minority of them are because the brand dumped them, although that does happen frequently.
When Deepwater Horizon happened BP sold almost all of their gulf states stations to Marathon. Because nobody in the gulf was gonna buy gas from them (and many still won't). A lot of those stations had contracts expire in the past 3 years and I've seen a large percentage of them rebrand as BP again.
There are reasons that a body stays in motion
At the moment only demons come to mind
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