Decentralized applications are well protected from fraudulent activities and hacking attacks as there is secured cryptography and, as already mentioned, absence of central point of failure . In centralized web, all data is stored on a central server. If it gets shut down, it takes your data away as well! This is a somewhat a way to ‘a permanent web’ where your data is secured and where you could choose to store the data yourself or have it replicated across many different clients as many times as you want it.