There's a malediction that reads: "You have lawsuits and you win them". The idea is that lawsuits are so painful that even if you win them, they're so draining

There's a malediction that reads: "You have lawsuits and you win them". The idea is that lawsuits are so painful that even if you win them, they're so draining that you wish you never started them. If I were you, I'd focus on your real customers and wouldn't lose much time on the deadbeats. When you realize that there will be always people not wanting to pay (either open source or closed source), you can better focus on your customers in a lot more relaxing way.