"If I hold the keys to your house, it doesn't mean I own the keys. I might've stolen the keys to your house. You might have lent me the keys," Nguyen said. "It doesn't prove who has ownership of that property or that asset."
Maintaining the current method of storing bitcoin also cuts into its value, both as a new form of payment and as a security, he added".

https://markets.businessinsider.com/currencies/news/bitcoin-price-btc-inaccessible-cryptocurrency-digital-currency-wallet-security-blockchain-2021-1-1029961482