Not gonna watch an hour of video but from the blurb,

I had the pleasure and heartache of interviewing Keonne Rodriguez, co-founder of Samourai Wallet, an open-source, non-custodial privacy wallet, who goes to prison this week because of the privacy tool he created.

Maybe some web searches could help figure out what happened. I hadn't ever heard of that guy before. There are certainly tons of bitcoin wallets out there whose implementers didn't encounter such problems.