If someone doesn’t want to pay for your game they would just pirate it.

I get that’s a disappointment for the publisher seeing a sale and then seeing that sale dissapear. But AFAIK they do not have to do anything, Steam manages the refund for them, so it’s harmless.

No matter how well you try to adjust the window, I could just copy the game files in my computer, apply the crack if needed and be done with it. I could ask for a refund after just one minute if I wanted. So my advice would be, don’t worry about it. You will be paid, as always, by people who appreciate your work and want to give money to you, and, as always, some people will play your game for free.