No, I mean personal liability for whoever signed under initiating this suit (and maybe sanctions against the lawyers too). US legal system is, however, maximall

No, I mean personal liability for whoever signed under initiating this suit (and maybe sanctions against the lawyers too). US legal system is, however, maximally removed from this - instead, we have a concept of immunity where it is very hard to prosecute a government officer for something they did while executing their office. Ancient Athenians had it simpler - if you bring a lawsuit and less than 1/5 of jurors vote in your favor, you get a heavy fine for wasting everybody's time. Unfortunately, wouldn't work in the US - about 1/3 would vote for anything if it helps their tribal interest and hurts the opposite tribe, even if it's ruinous for the society in general.