For linux only, lan only shared drive NFS is probably the easiest you’ll get, it’s made for that usecase.

If you want more of a dropbox/onedrive/google drive experience, Syncthing is really cool too, but that’s a whole other architecture qhere you have an actual copy on all machines.

If this is a real thing and not photoshopped, the fact that they feel the need to hide their faces is depressing.

Heh, now the parralel in my mind is developpers that put in microtransactions or force a subsribtion model with no option to buy.