Even if he leaves his Bitcoin online, the possibility of loss is still possible. My friend forgot his wallet recovery keychain and he lost his money. He sent a letter to Coinbase wallet support, but they couldn't do anything because the signatures are private and confidential.
Many people have lost their Bitcoin wallet password and can't find it again.
The news from the above article is a wake-up call for us about managing our cryptocurrencies. Bitcoin or cryptocurrency is financial freedom, self-regulation. It is not like a traditional bank, so we need to be serious about managing our own assets.