I see it as similar to the issues raised in this lawsuit that accused Intel of bullying customers out of using competing products. Intel's offices were raided shortly afterwards.
Try making a reservation at Hilton and having them say, "Did you stay at a Marriott during the last month?"
"Why?"
"Because we'll assess a $5 surcharge."
"Well I didn't, but I stayed at a Holiday Inn. Are you still gonna charge me?"
"No, we are only penalizing Marriott customers."