It’s also (still) available on Android and iOS.

That’s how it’s done here as well. A USB modem attached to a raspberry pi (or just any pc) which answers the dial up connection from the Dreamcast, routing it through broadband.

I love projects like this and I have connected my Dreamcast, but never when I went to play has anyone actually been online. (anyone can check who’s playing online with their Dreamcast here: https://dreamcast.online/now/ )