Bought 1 coin, so why did I receive slightly less?
Definition: Spot trading fees are usually calculated by multiplying the transaction amount by the fee rate. A fee is charged for each trade, and partial fills are charged only on the portion that was filled.
The reasoning behind it: When estimating your profit or loss, you need to include the fees for both the buy and the sell. Looking only at the price difference will overestimate your net return.
On Binance, you can enable paying fees with $BNB and enjoy a certain discount according to the applicable rules.
Don’t follow suit just because everyone else is doing it.

I’m just sharing—this isn’t investment advice.