What a great loss due to ignorance and not putting the safety of his bitcoin wallet as his priority with such huge amounts of money in it. This is why newbies should learn how to keep their wallet safe because the been in self custody of your coin comes with a lot of responsibility so that your wallet wouldn't be compromised in whatever way. He should have just continue yo use sparrow desktop wallet and his hardware wallet. Does sparrow wallet have a desktop version currently? Or am I missing something.

IPhone users should be very careful and make sure that they verify the signature of a wallet is authentic before using it.