There are soo many people out there who do sub4sub that it's getting frustrating because you hardly ever know whether someone's comments are genuine or they have a "hidden agenda". If someone asks me to check out their channel I usually do and leave a (normal) comment on one of their videos but when that person does sub4sub, that comment only invites other sub4sub people to subscribe to my channel because they think I do sub4sub as well.
I don't understand how people can be happy with a channel filled with fake comments and fake subs. Why are they even doing YouTube?