

Helium was interesting, but they locked it down so you can only use their proprietary hardware for access points, it seems kinda scammy.
IPFS is used by several archive projects like Anna’s archive and libgen.
Meshtastic is a distributed local mesh network for text messaging.
Some forum software is starting to support activitypub with plugins. If they add the plugin then you can follow and interact with the forum from Lemmy. The best option for everyone is to start pestering forum admins to add those plugins so they get users and Lemmy gets more content.
Long term creating migration scripts for popular forum software like phpBB, so content, users, etc, can be moved to a custom Lemmy instance would be an option.