It is uncertain whether etf funds make money or not. Etf funds mainly earn bid-ask spreads, and investors can gain income when the fund price rises. If the fund price falls, investors will suffer losses. The rise and fall of etf funds is determined by transactions. When a fund buys more than it sells, it goes up, and when it buys less than it sells, it goes down.

Etf is a kind of fund, which tracks a specific index, and constructs the portfolio of index funds by buying some or all of the stocks of the index, with the purpose of making the change trend of this portfolio consistent with the index, so as to obtain roughly the same rate of return as the index.