If the A invests $1000 in bitcoin, then the next day the price of bitcoin drops dramatically and the A loses $1000, which makes me curious, where does the $1000 A money go?
Bitcoin investment is like any other form of economic investment. If you make a profit of $ 1000 and someone is losing $ 1000. If you lose $ 1000, then someone will make a profit. There is always a balance in the economy. You lose money, and someone will make a profit and vice versa.