I don't even understand the meaning of this sentence. Blockchain applications? What do you mean by blockchain applications? Do you mean DAPs in the ethereum blockchain or DeFi projects? The crypto exchanges and crypto wallets aren't exactly blockchain applications.
I hear the term "blockchain fraudster" for the first time. How do you define that term, OP? I guy who uses the blockchain for conducting fraud? Can't you just call these guys "scammers" or "hackers" instead of "blockchain fraudsters"?
The only way to reduce or prevent fraud, scams and hacks is to be cautious with our own browsing activities and staying away from things that sound too good to be true.