You can play with your partner on a pirated copy if you connect to a server without authentication or host one yourself

If the game has you host servers yourself, you can pretty much always use a pirated copy. If they could detect the piracy on your computer anyway they would already be blocking you from playing. If you connect to a server they host then they could have extra verification, but if you're hosting it then it's not going to be anything that isn't already being checked to prevent piracy.

It's really easy. I use SKLauncher and a dedicated server. You need to disable some player verification setting on the server but that's it.

Try Luanti. If you haven't been playing MC recently you honestly may not even notice the difference

You can also play co-op with a single PC nucleus-coop.github.io/

Wait the movie actually worked?

Ouah, this really is the moronest timeline