Is IKON legit or not?

Hello, Is the IKON legit Riot partner or not? I've noticed some well known streamers in the list and they promote to participate in their challenges, however, it requires installation of a desktop program in order to participate. The app has "Overwolf" in its name and I remember program with same name involved in many permanent bans for use of 3rd party software in the past. I couldn't google up any information if this is indeed legit Riot partner or Riot is not involved with them in any direct way. Can anybody help? {{sticker:sg-lux-2}}
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