That's not always as easy as you seem to want to make it. It can take a long time to establish a field and a product line, a copycat can skip all your mistakes and take the end product. Now: it all depends on what was copied. They've copied code, text from the website, other documentation they may well be in serious trouble. And then it helps that they happen to be funded because that makes them a nice fat & juicy target. The last thing you want is to sue some party that is penniless.