If both parties have F-Droid installed prior to the internet going away or being censored or whatever, other apps can be shared locally from a single device that has the app, to any other F-Droid user:
https://f-droid.org/en/tutorials/swap/
If both parties have F-Droid installed prior to the internet going away or being censored or whatever, other apps can be shared locally from a single device that has the app, to any other F-Droid user:
https://f-droid.org/en/tutorials/swap/