How can anyone justify this? Crypto.com user loses 13% of their funds to sell their crypto. Their position was up 15% and considering the buy fee they probably lost 20% in fees overall – which makes their +15% profit on the trade a net loss.

What you are seeing is Crypto.com's way of robbing their users through spread. They mass market and direct crypto noobs to the crypto.com app where they scam users with insane fees. Historically around 15% for a full trade but this full trade would be closer to 20% in fees.

When you buy on the app crypto.com sells you crypto for way above above market price, and when you sell on the app crypto.com sells your crypto for way below market price, robbing you of your funds in both directions. In this case this user was up 15% but is still set to lose money on the trade – due to crypto.com's scammy practices and stealing 20% of their funds on the trade.

You might recall a crypto.com ad "ace your trades and we'll manage everything else" – it should have just said "ace your trades so we can steal your profit."