Identifying every user in platforms like Coincheck would be a start to avoid this situations, a robbery is always done by experts who really know what they are doing and will never get caught (or think they know and are immediately caught).
Even if it takes longer to create an account on this platforms, they really should consider taking their time to see who they are accepting into their site and use their services, that way they would protect their users and increase trust on the platform which would bring more and more new users (benefecting all the crypto world).