The thing is that they have the data of tons of users and their behaviour, the time it takes between different actions and most importantly the time they spend

The thing is that they have the data of tons of users and their behaviour, the time it takes between different actions and most importantly the time they spend on the site itself. A bot would be using for way longer times twitter instead of the 1-2 minutes the normal user spends on his twitter feed. Anyway interesting project, I like the idea of a not so spammy bot for getting more followers.