What does HackerNews think of magic-wormhole?
get things from one computer to another, safely
Because its remaining an issue enables "value extraction". Magic wormhole would work if people knew about it but somehow software that promotes itself by honest word-of-mouth has difficulty competing with software that is bundled with Windows or is made by the world's largest advertising corporation.
There is also https://chunk.io/ in the https://transfer.sh category. It requires free registration by emailing the owner. It has some interesting features, like uploading multiple files in one HTTP request and syntax highlighting for source code. Files are associated with your account, so you can delete them without a per-file token and list them.
https://github.com/schollz/croc is like Magic Wormhole but can send multiple files and resume transfers. It is written in Go. It releases official static binaries, including for Free/Net/OpenBSD. (Magic Wormhole has alternative implementations with static binaries: https://github.com/psanford/wormhole-william, https://github.com/magic-wormhole/magic-wormhole.rs.)
Syncthing is painless, with available local network detection of other clients. If either device has a webcam, the QR codes in the web UI make it quite quick to have a synchronized folder between two systems.