If I show up as a new person, with my fantasy, fake, fraudulent, Gedcom, that I don't know is fake, and I upload it, did I do anything wrong? Nope. If I even have fake sources, I have not violated the honor code.
And so, you may see fraudulent lines come back again and again. In 10 years, we may be having this same conversation.
If, on the other hand, all of these profiles exist, are PPP, and have a huge warning banner "hot, don't touch," and a newbie comes in and starts creating duplicates, he/she will see this and will start to ask why. Or, they will select the existing profile to link to their tree. When we see one of these PPP profiles getting "linked" to some new tree, we'll know that it has come up again and you can quash it right away.
Delete them all and you won't know until RJ notices that the 400th profile looks fishy...