Because this boom was the first time it was really in the publics eye. The previous ones happened when very few people had ever heard of bitcoin. This one hap

Because this boom was the first time it was really in the publics eye. The previous ones happened when very few people had ever heard of bitcoin. This one happened when most people in the western world have heard of it. If they were going to get on board they would have done it but they didn't because for most people with money bitcoin offers very little upside over their existing systems with huge risk.