Twitter blocks/suspends you when they notice that you are using a third party app/site to boost your number of followers. If you claim thsee site are legit you should audit your account with twitter audit and see the number of fake followers on your follower list. It's almost impossible to dodge the bots/fake followers when you use these "boosting" sites.
"boosting" sites - It is a software for controlling Follower and Unfollower.
its note cheat / hack / boost .
Simply, you will spend on adding your subscribers not 1 hour and say 20 minutes.
For kick all fake us auditi no problem )
For a good tweet comes up to 500 people. And if you constantly add such a quantity to the hand. It will take a lot of time.