after all if they were not successful once in a while I doubt they will bother to keep doing something that does not gives them any profits.
Scammers are on everywhere and they are to scam every time either they become successful or not. They are trying not only on this platform but also on others and they are not using the same method to scam peoples but they are trying to scam people in a unique way. Sometimes they are become failure and sometime they may become successful.