If you know about blockchain then you will know it is not fraudulent. Because of its nature is decentralized. No one will control the algorithms.
There are so many fraudulent activities that is happening in the world of cryptocurrencies. We need to be cautious about the kind of activities that we can engage ourselves in so we don't fall victim to activities of scammers. We can be vigilante by following the security tips that are given in the form of publications by well experienced crypto enthusiasts.