I don’t get it. If I stop being a customer of the ISP, I lose whatever I was paying for from them. If I hate spending the money, I can change my email address.

I don’t get it. If I stop being a customer of the ISP, I lose whatever I was paying for from them. If I hate spending the money, I can change my email address. At a generous 10 minutes per change, it’ll cost me less than 4 hours to change 20 of them. 4 hours to save 90 pounds a year or 4500 pounds over the rest of my life seems straightforward. Not much different than the classic work of changing a phone number or mailing address when you move. I can’t imagine asking the new owner of my old house to keep getting mail there. For this reason I would never use an email address provided by a telco.