I was thinking about how online banking works today. They don't really have to worry about security because you can only wire to pre approved payees.
If a company like Apple was to one day allow BTC to be held natively they wouldn't want transactions to be able to be sent anywhere. One Webkit exploit combined with userland root access and hundred of millions users wallets are empties instantaneously.
But if the BTC are somehow held in a way that they can only be send to white listed addresses their is recourse for users.
No, Apple would have to hold your Bitcoins under their custody to gain the ability to censor you, like PayPal. But if you truly wanted to use Bitcoin, why would you use it through a centralized entity that removes its main value proposition?
Is there anyway this can be accomplished on the blockchain?
No.