With a modern blockchain, I believe the AEON project has been very well developed. But is the security of the project tight? Is there a guarantee that no hacker can penetrate?
Miners secure the network as in any PoW coin. You can make 51% attack and cheat an exchange or someone if you are able to get enough hash power for few hours.
But usually people lose crypto by not storing their private key properly.
If you have best security in your house. bars on windows, bulletproof doors. But if you place your front door key outside on the driveway, then anyone can get into your house.