The point is to shut people up. Lawyers don't like filing literally frivolous suits, that type of activity gets you disbarred.
Many years ago in Northern CA we had a lawyer that was basically going around filing suits against everyone she came in contact with as a way to pay the bills. She was eventually declared a "vexatious litigant" and had to get a judge's permission before she could sue anyone in the future, but they didn't disbar her.
She might lose a lawsuit in summary dismissal, but the defendant is going to be out thousands of dollars by the time that happens. Anyway, the goal was never to go to court in any of her filings. What she wanted was to bully people into paying a settlement, since that meant she didn't have to pay any court fees.
In environmental circles, Greenpeace is very well-known to be traitors working with big corporations to launder their image. They're opposed to sabotage and revolutionary tactics. Their activities are mostly fundraising and legal proceedings, and on the rare instance they perform so-called civil disobedience (such as deploying banners on nuclear plants), it is in very orderly fashion that doesn't provide much economic harm.
As a left-wing environmentalist, i wish such a strong voice as Greenpeace was capable to incite people to rise against the greedy corporations destroying our planet. I just don't see that happening, neither here in France nor in the USA.