Tens of billions worth of Bitcoin have been locked by people who forgot their key. - Insidermag

Of the existing 18.5 million Bitcoin, around 20 percent — currently worth around $140 billion — appear to be in lost or otherwise stranded wallets
Read more: https://insidermag.net/tens-of-billions-worth-of-bitcoin-have-been-locked-by-people-who-forgot-their-key/?source=Snapzu