If I were Sel, I would consider doing what you suggest with tracking, and at the same time implementing a progressively rising cost increase for any and all new subscribers. Each time the game gets leaked within two days, the price goes up. No leaks for at least two days, the price stays stable. I mean, some people here are such cunts that at some point I'd probably do it out of spite. Sucks for trying to grow the game, but you're going to make the life of someone trying to join simply to leak miserable.
Again, there are pages all over this site where people come together to punish people for being cunts and fucking over devs with instant leaks. There are mandatory wait periods before leaks all over the fucking place. The idea that there's no reasonable middle ground is a fucking joke to anyone who's been here for a while. (yeah, yeah, I know this account is new, but I'm not).