"Stuck" may have been hyperbole on his part, but I'm in a similar situation so I sympathize.
20 years ago I had a dialup internet connection from BellSouth. The associated email address was, and still is is, my first name @bellsouth.net. I've had that email address for two decades, two moves, four jobs, and several ISP changes. When I no longer had a need for a backup dialup ISP and I stopped paying BellSouth (AT&T at that point), they let me keep the email account for free. That email address is known to most of my family, friends, coworkers, former coworkers, and various other business associates and acquaintances. It's been on my resume and my business cards. It's been used to register for numerous services I've long since forgotten about but might want to access again someday. I haven't used it as my primary email in years, and I don't usually give it out to anyone anymore, but it's been in circulation for so long that I have to check it, so that it stays active and so that I don't miss anything interesting or important.
AT&T offloaded its customers' email accounts from their own interface to Yahoo several years ago. I normally use an IMAP client instead of the web interface, but that's beside the point: there are a lot of people who are somewhat involuntarily attached to Yahoo Mail, either an account they created @yahoo.com years ago, or with their current or former ISP email address. Yes, people could just abandon those addresses and never interact with Yahoo Mail again, but that isn't a reasonable option to me, all things considered. I am, in a way, "stuck" with that address until I die or AT&T decides to shut it down, whichever comes first.