Weird how you convinced your friend that Bitcoin isn't a scam by just giving him the basic description of bitcoin without even tackling the scam argument lol.
Also, Bitcoin isn't untraceable.
Lol , it was a summarized video ,I actually went as far as introducing him into the bitcointalk 😏
All the peoples are know about the Bitcoin, may be your friend was not believing the Bitcoin you can show your wallet address or you can show your past transaction. But if you link the youtube link all are thinking you trying to promote your channel. Mostly everyone know about the trading so if you introduce your friend they must ask question about cryotocurrency then they enter into Bitcoin.