I don't think DT is about to just walk away from such a huge base of customers. Losing money or not losing money, all those customers would be a base for any future services they may offer.
Walk away sounds like they would lose a lot of money. But spinning them off as an IPO or selling them to someone else brings a ton of cash to DT. I think this is more about DT not wanting to continue doing business in the US and using the sale proceeds to invest in the EU markets.