Usually not. However, some services offer a free trial where you can get 50 or so likes or followers on your account, as proof that the service is genuine. The companies need to pay real people to follow you and because of that, they can’t offer them for free. The good thing is that we’re usually talking about affordable prices, where you can buy 10, 15, or 20k followers for around $100 to $200. Compared to the time it would take you to build such a following otherwise, it’s really not expensive.