The buy/sell difference exists in all markets irrespective of whether you trade cryptocurrencies, stocks, bonds, or forex, so it is not something that CoinSwitch Kuber decides, but the market decides. To clarify, this gap or difference between the lowest asking price (sell order) and the highest bid price (buy order) is called the spread.

Any trading markets work on spreads, i.e., the difference between the buy and sell prices; it is natural that one of these prices will be high and one lower.

You can refer to the below article to understand this difference better:

https://coinswitch.co/kuberverse/difference-buy-sell-prices-coinswitch-kuber/