If the game is local co-op ask you need to do is click a checkbox.

Also community mod support.

I get that the post is probably just meme, and that if real the type of person to post this probably pirates all their games on Linux and doesn't use other storefronts either, but like do they want everyone to do the same thing? Don't we want to buy games from developers so they can continue to do that? And the other storefronts, well one, might have a lower cut, but they also provide pretty much jack-sh unless you count money upfront and no lasting support as being a provider.