No, this is not a hack. We don’t encourage people to hack the game or cheat or anything. THIS is a community effort where people provide information with one another! Come on, we play Pokemon Go as a one big family!
Check out their official description:
Poke Radar was built by Pokemon GO enthusiasts for Pokemon GO enthusiasts. We’re all in this together and we want to give the most accurate locations as possible for where to find Pokemon. We’ll constantly be updating Poke Radar for Pokemon GO, so be sure to check back and tell your friends!
They basically let people share information with one another. This is not a hack, so it will not be ban. However, this is based on trust, people have to trust one another to use this effectively!
Will YOU use it?