Magic Wormhole: get things from one computer to another, safely

What ever happened with just setting up ssh or sftp?

"I don't get why people use syncthing, can't they use bluetooth file transfer and USB cables like us oldschool peeps?"

read the doc.

SSH requires previous arrangement (you need to transfer the SSH key to your friend), magic wormhole is a way to arrange such a meeting without physical proximity.

or requires typing a password into a phone.