You can see why, though. Even in this case where they thoroughly won, and got damages, the damages were just $225K, and they probably spent millions on legal fees, employee/founder time, etc.
Ultimately, the American legal system is pretty broken. If someone brings a frivolous lawsuit against you, and you defend yourself in court, nearly 100% of the time you’ll be losing money, often a lot of money. This is the core reason why patent trolls exist, why companies normally settle out of court - it’s cheaper to do so.