Cold storage is not prone to attacks online, the only risk of security for cold wallets is that it is physically stolen from you. Unlike Coinbase which locks some users accounts, you can access your funds anytime. You have to watchful because cold wallet are far more inconvenient when you are trading.
I understand that the online platforms are prone to cyber attacks but doesn’t the FDIC insurance make that a non issue? The frozen accounts thing is concerning. I wonder the reason?