Literally saw this happen at our Meetup this week. Guy that had been in Bitcoin since 2012 used a paper wallet service he had “always” used.
Sent 9 BTC and it was swept.
He never stayed current with how to secure his BTC. Last I heard, he is now trying to get the FBI involved. nostr:note1cgqtjz7fvc5gjeytqj46wvljyx2wwt5d5kfh55qzvu59c3tvpahqwea4lu