I think Gawker was wrong, and deserved to be seriously damaged by this (and many other things), but lets not pretend that this wouldn't have hurt them if they weren't wrong. Defending yourself takes an enormous amount of energy, time, and money. If a billionaire hates you they can fund lots of lawsuits against you that would have otherwise never materialized. This would constantly drain you, even if you win, even if you win costs. Since the billionaire is just funding it, they don't even need to step into the court room to ruin your life.
In this case Thiel waited (probably) until Gawker had done something particularly bad (at least liability wise). That's good, but its easy to see what someone of his resources could choose to do with no apparent repercussions. Of course this is disturbing. The fact that our court system is abusable in this fashion doesn't mean we shouldn't be concerned about the individuals who might so abuse it.
The article took this case as proof and omen way beyond what it actually shows, but its not nothing.