nope,
since when blockchain did that thing ? as far as i know, blockchain is form of freedom in term of financial and it is a tool for us to upgrade our traditional financial system by using technology, lightening and fastening every transactions that we make.
plus do not forget that blockchain transaction is irreversible, which means it does not help you prevent any scam because once you send a money or coin. you will never get it back
Yes, but this is great. It gives you all the power, no middle-man, and no other than yourself to blame when you mess things up or fall for a scam.