I disagree with your blanket statement on fraud. Pink sheets are a portion of what trades OTC. There are other types of securities like F-shares (foreign listin

I disagree with your blanket statement on fraud. Pink sheets are a portion of what trades OTC. There are other types of securities like F-shares (foreign listings that trade in USD) and other trusts. GBTC: the only bitcoin fund in the US trades OTC. (NB: trades at a massive premium so you're better off trading the underlying)