What Is Funny, this actually his loss. He lost a 40$, and if keep doing it with others, eventually he will lose more money because there is difference between 5-10$ support, and a 40$ support.
You don't fight against piracy , you calculating with it. He is at the point where he actually doesn't lose money, he keep gaining patreons, and will gain extra with the Steam release, but if he keep cutting off the 40$ donors...... . But this is just my opinion, surely he knows better, after all he has time to track down the " leakers "