Hi there, I’m posting here because it’s more underground compared to Reddit (since I think that the dev wouldn’t like it to get mainstream attention).
There is an open-source WC3 engine called Warsmash (made using LibGDX): https://github.com/Retera/WarsmashModEngine
( Discord server: https://discord.com/invite/ucjftZ7x7H )
I thought I might share it here, if anyone is interested in participating in its development. There isn’t a Flatpak version yet and it also misses some features e.g.
Maybe you can convince him why GPL is better? He is usually quite active in the Discord server.