Hitleap is even worse than most, because you run an app that automatically visits the sites. So it's not even like they have ANY impact -- you start the app, tell it to run, and then minimize it. At least some of the normal traffic exchanges are in a browser where they MIGHT be seen from time to time.
Yeah same as adfly this use to be booming to get results from, now tho it is becoming like the rest, botted, proxy, and exploited and no use of their services. I could go to adfly and get around 30 to 40 sign ups a week now am lucky to push that in a month or 2 months to being exploited by botted traffic and gaining money for views that way and people who want honest services now revert to old PTC sites and even them are all exploited. Think needs some massive updates and changes to how sites are done and what capture systems are used to prevent it from being exploited and cheated.