"These sites" can only refer to sites that were previously mentioned. The only sites mentioned in the same paragraph are the trusted sites. It is a grammar mistake to use it to refer to the "good deals" sites mentioned in the bullet points far above, since that antecedent is much...

... Pirating the game hurts us less than using these sites.

You mean than using other sites.

Using these sites (the sites that are reliable sources that you specifically mentioned in the previous sentence) isn't going to hurt you more than pirating!