The blockchain platform is a technology that underlies the operation of crypto coins. It is transparent, decentralized and in the records of which it is impossible to make changes. You can lose your investments if you are not careful when storing your coins, but this does not in any way relate to the blockchain, but only to the exchangers and purses that you use.
it is true that if we lose money or assets it is not because the blockchain is less secure but because the wallet that we use is the less secure or the way we store privacy is wrong then we can be hacked, this is also experienced by the hackers who have been hacked