like FINRA regulates stock market, who regulate crypto currencies?
Nobody. It is decentralized like when you seed/download files from the torrent. Nobody owns it, nobody controls it.
Goverments can regulate exchagnes that are located in their country, but they can't regulate all aspects of it.
Best is when people say it is not regulated, but it was build not to be regulated in the first place, or I have got it wrong here?