magic-wormhole is useful for terminal-to-terminal in realtime. I actually wrote something similar for that too [1] because I didn't want to have to rely on a Python ecosystem. This new server is mostly useful for browser<->terminal or browser<->browser sharing, especially when its not realtime oriented. share is very similar to transfer.sh and send.firefox.com.

[1]: https://github.com/schollz/croc