Berkeley has this really cool program called BOINC that you can download and donate your computer’s resources to processing scientific data. There are a bunch of projects to pick, from working on climate change, to cancer, to the Large Hadron Collider.
The good folks at linuxserver.io even have a ready to go Docker container for easy setup: https://hub.docker.com/r/linuxserver/boinc
Another possibility is running the Archive Team’s Warrior, which downloads data from at risk web sites and uploads them to the Internet Archive: https://wiki.archiveteam.org/index.php/ArchiveTeam_Warrior
Does anyone else have examples of projects like this? My dream is for the Fediverse to have this sort of feature eventually.
In what sense is this "opening a direct tunnel?"
I don't think you really understand what's going on here; or otherwise, I don't.
I've used BOINC without issue for over a decade.