Lots of people knew about bitcoin at the early stage, but they never believed in it, they were thinking bitcoin would die, they never expected such an incredible performance from bitcoin, so they never invested in it, but they now regret why they didn’t invest in it at their early stage. Some people refuse to invest in bitcoin currently, just because they think the bitcoin price is too high, and they believe if they invest, they won’t be able to make much profit. I'm sure people like that will be surprised in the near future, and they're going to regret why they didn’t invest now.