Yea I also lived in China for 3 years while doing my masters and OP clearly doesn’t know what he’s talking about. Everywhere takes cards and cash in addition to the digital payments. And no service I used was digital only.
Edit: The only requirement I encountered was a local phone number. Not a smartphone.
Uses the latest tech in linux e.g wayland and pipewire.
Fedora
https://github.com/rockerbacon/modorganizer2-linux-installer
I’ve used this for New Vegas. Instructions are on the page.