The safety of cryptocurrency depends on where and how it is stored. Keeping your cryptocurrency in centralized exchange and wallet where you do not have access to your private key is a recipe for hackers to easily have access. The owner of the cryptocurrency have a duty to ensure the safety of his cryptocurrency by ensuring he store or keep Is token or coin in wallet in which only him and him only have full access to the private key. He can do this by storing the cryptocurrency in cold wallet like ledger. He can also hold in decentralized exchanges or paper wallet. In summary the safety of cryptocurrency largely depends on the owner.