This indicator simply plots your entry price and the break-even point (green line). Area between the entry price and the break-even point will “eat” you profit by exchange fees. You can use the green line to lock your break-even point. I do not recommend using this strategy for trading, because the entry logic is based on SMA crosses. However, this script could be used within you own strategy to plot the break-even point.
For example, there is 0.1% Maker fee and 0.1% Taker fee at Binance spot exchange. You need to sum up those two fees to calculate the break-even point. Every exit above/below the green line will guarantee a profit (in our case it means 0.2% above the entry price for long position and 0.2% below the entry price for short position).