You can easily zip up a steam game and send it yes. And if the game developer did not implement any drm, You can play it as well. It would be piracy tho… so i support that ;)

I know you’re just trying to prove a point about physical disks, but if you actually wanted to borrow a copy of someone’s game, Steam will let you do it

You know it’s also illegal to send a copy of a physical game right?