I used to work at Aol, and it doesn’t surprise me that some significant number of people still use dial up. Not because they’re “trapped” but because that’s the only choice in some parts of the country. According to Pew, 3% of us are on dialup & more than twice that use no ISP (maybe that 7% just uses their mobile access?).

https://www.pewresearch.org/fact-tank/2013/08/21/3-of-americ...

https://www.pewresearch.org/fact-tank/2021/04/02/7-of-americ...

… I’m not sure, but it seems plausible that if 3% had to use dialup 100% of those are on Aol (who else offers dialup?). So there’s probably a lot of money to be milked from that cash cow; along with their other ad & publishing businesses.