Actually, dial-up in Germany died 2 years ago: https://www.teltarif.de/internet/by-call/

And since dial-up just uses a regular phone connection, there's nothing stopping you from dialing up a dial-up provider from a different country, so dial-up still works in Germany.

In fact, you can host your own dial-up gateway at any time. All you need is a PC with both a dial-up modem (which are still readily available on places like Amazon or Galaxus) and an internet connection. Set both interfaces to bridge mode and you are your own little dial-up provider.

In some places this is still used in place of a VPN. Just put a dial-up modem inside the private network, connect it to a phone line and dial-up from the outside to get into the private network. Add a phone number allow-list to prevent access by unauthorized people.

The technology is ancient and not in wide-spread use anymore, obviously, and hasn't been in a long time. But that's the same pretty much anywhere. The main reason why AOL still had the service running (and why German providers did until 2023 too) is because it costs almost nothing to keep the service running for the handful of people who are still paying incredibly expensive internet contracts from the 90s.

Similar story with analogue telephone lines. In Austria there are only ~4000 customers left who use analogue telephone. But it costs nothing to keep it around and the people running it haven't updated their phone contracts in 20+ years and thus pay crazy prices.

Just over the weekend I browsed trough my old blog (yes, those were a thing too) to check which year I did some remodeling on our house and stumbled on a note where I complained about slow 3G connection about 10 years ago. Compared to traditional dial-up that's still orders of magnitude faster(~10/1Mbps back then on our location) but on a snowy day (with severe packet loss) it apparently took 10 minutes to get Skype and XMPP to even log in and over a minute to get SSH session open.

I suppose you can just barely get email trough today and even then you better not be in a hurry.

I don't think you appreciate how remote many people are in the US. There's now way they would ever run cable or ISDN out to them. A run of an ISDN line can only be really short.