There's no need to "stop" companies using fake followers. It's just an incredibly stupid idea. 10,000 real followers indicates some proportion of those people talking to their friends about you, mentioning you on other media, possibly doing crazy fan stuff on youtube. Real followers beget more real followers. That's what viral in this context implies, (although it is a creepy and unattractive term used by creepy and unattractive people.)
10,000 or a million fake followers won't do that for you. Go ahead, throw your money away if you want to pay for imaginary people to say they like you.