Both are also in heavily regulated industries with oversight from state utility commissions and the FCC, where simply trying to exit a market requires a whole proceeding before the agency/commission. They could announce that they'd be exiting the industry and selling its assets to a competitor, but that would have to clear antitrust hurdles and would take a while.

I think that means that effectively, they can't just "kill" these services but would have to sell to someone else, and the approval process itself could result in some concessions for the consumer, so that even Satan ISP would have limited power to really screw over the consumer.