Actually, in 2019 I was looking for land just outside Albany NY (Greene County). Very little (like 15% of population IIRC) of that County had high speed internet available! Cellular internet wasn't much of an option either, so yeah, dial up!
Of course, although I know a fair # of people w/ AOL email addresses, I wasn't even aware AOL had an actual "service", so low %age of need for dial up coupled w/ low number of users I can see how it's not viable/prudent to maintain a dial up option.