The people still using dial-up are the people in low income or rural areas that the broadband providers have chosen to skip over.
I used to use it until the company that I was getting it thru folded just before the whole pandemic thing. When you live in an area that the broadband providers won't service it was the one option people had - and now they don't. I didn't use AOL because it wouldn't work with the computers I had, but dial up was at least a way to check an occasional email or something. Admittedly it was becoming less useful toward the end because almost everything onlnine was designed around the assumption that "everyone" has broadband connections, despite reality not matching the assumption.
And yes I'll admit its frustrating to read the posts asking "who would still use that" written by people who are fortunate enough to have access to a broadband provider and assume that everyone else is allowed that same access. Outside of access thru work, my "ISP" is taking a laptop and driving 10 or so miles to a Starbucks or the parking lot at WalMart. So while AOL turning it off won't impact me directly, it will impack some people who don't have any other options.