I wonder if you ( Dev of US2 ) can make a Cracked version of the game and share it as a Torrent.
But adding small problems ingame For instance, The devs of ( Game dev Tycoon ) made that after some time, you were facing Bankruptcy because people pirate your game ) This was only done on the false version they have uploaded.
Basically, if you make a false cracked game which you upload on any torrent website, you might become the most seeded. which give you power over the pirated game in some ways.
You could make the game a bit buggy or having popup or something which will interfere with the players
( buy the game now) or something might be funny to see. Or simply entirely disable different option like changing the mass of a planet without saying that it is restricted because it's an illegal copy, just let it apear as if it was a glitch. you might even have players coming on the forum claiming they found glitches which might be hilarious.
Plus maybe you can add an ingame poll or something which send anonymous data to a server where you can see what they think about. and how many people installed it.