Strategy Commission

Hello Folks,

I am New to cTrader and want to use one of strategy by copy trading, I just wanted to how know does the strategy commission is deducted from profits on monthly basis and how does negative months offset. Are negative months' commission is zero and only positive months commission will be deducted then if annual PNL is at breakeven still commission has been paid on positive months, which doesn't seem fair.

Can someone put light on the same.

Thanks