Gotta love old people adverse to change, or thinking they still need to pay for email.
You still need connectivity to access free email providers. And for older folk who do nothing other than email, do not have smartphones, but do have a landline... 20 a month on dialup makes more sense than 50 a month for Comcast.
Sure, it sounds ridiculous to us who are permanently connected and do not even have landlines... but to the 65+ community, there really still is a small, shrinking, but real use case for dialup access.