Sure, you can do that. It’s obviously on you to figure out how you want to do it, but that’s exactly what no DRM means
And I don’t mean it’s technically possible, you can backup the game files through steam and put them on a flash drive, and there you go
In fairness, humans do this too. Ever share a meal where someone has already eaten? People find it extremely off-putting. It’s to the point where pacing your eating to someone else will make them like you more