Narrow claims to interact with “Twitter users that are talking about subjects relevant to the audience you want to attract”, which is code for automation technology.
The most successful Instagrammers know exactly how to attract more followers to their page, and what’s more, they know how to keep them around, too. If you’re serious about maintaining a beautiful, attractive Instagram account that people are going to want to visit, then you need to know how to do this.
The problem with their direct followers is that they are fake. This is just another fake follower, botting service.