The money you keep or lose does not come from central banks, but rather from us individuals. We are the liquidity. And the big players in the market manipulate us as they wish.
If you cannot identify liquidity, you are liquidity. That is a very popular statement amongst traders, and the purpose is to encourage you to be more observant of liquidity sweeps.
Good and experienced traders know how to avoid liquidity sweeps, but new traders will always find themselves in a situation where the market acts in an opposite direction from the direction it is supposed to act, taking them out of the market and then continuing in the direction they expected it to go before it took them out of the market.