Crypto’s culture encourages investors to “HODL,” or hold on for dear life, in the rollercoaster ride of bitcoin ’s extreme fluctuations. But this long-prized practice may diminish as adoption of ETFs grows, particularly if traditional investors who are accustomed to rebalancing their portfolios regularly add in bitcoin exposure. The cryptocurrency has become increasingly institutionalized in recent years and since the launch of exchange traded funds this year that track bitcoin’s price, that trend is expected to increase.