Your friend is lucky. If he invested in altcoins, maybe that could be the altcoins era that is the time before 2017 when the rally for altcoins was very high. Coins like etheruem at that time were very cheap and ico scam was not that rampant.

Maybe he was part of those who bought bitcoin early like 8 -10 years ago when the price was still below $1k. He is worthy of commending if he actually saw the future from the risk he took because some people saw the opportunity but felt cryptocurrency investment was all fraud.