Aside from what the others pointed out, sub4subbing being against the rules, it's also just not a very good way to properly grow a channel. Having a high subcount, with no view retention, or engagement, doesn't help your channel at all.. which is usually what results from sub4subs. Focus on making quality content first, maybe look into some collaborations, and you'll be surprised how much better that works than sub4sub. Good luck man!