The crackdown in cryptocurrency by South Korea, China, and other countries is causing $GBTC to fall 50%. That's $30 billion evaporating. $GBTC, GRAYSCALE BITCOIN TRUST / H1 Previously: Bitcoin selling signal.NBR covered the drop today. These are the other reasons:uncertaintymany "investors" (speculators, really) who could not afford to lose bought crypto.in the long-term, technological advancements will make the currency usable in the real world.crypto here to stay even if it dropped 95% (for example). Kodak $KODK entering the field is another clear sell signal ahead of today's drop.Related investments: Hold $SQ, $PYPL, $V, $MA instead.