How to understand Uniswap charging fees:

The canned beer in the vending machine sells for 3 yuan. Uni Labs set up a stall next to the vending machine.

The beer is poured into a cup and sold for 5 yuan. Why two more yuan?

Because the Team is pouring wine with love, and you may need to check your ID and pay taxes when buying wine in the future,

At that time, Uni Labs will only care about the wine in the cup. If you don’t like the price, you can buy it from the vending machine.

Or if you want to set up a stall nearby and sell 3.5, you can do that.