Even if you are ultimately paid back, you first have to win the case. Until that happens, you have to foot the mounting legal bills. And there’s a plethora of possibilities for lawyers (especially in the US legal system, but others offer some as well) to drag the case on almost indefinitely and rack up costs. Documents seem to be one of the usual ways (demanding lots of documents from the other side, or flooding them with truckloads of largely irrelevant documents).

Simply making sure the case takes as long as possible to be concluded and costs as much as possible works in practically any legal system as a way to gain an unfair advantage if you have more money to burn than your opponent.