It 1000% looks shady af, I felt the same, but I've been using it for like 5 years now with no issues. Can always run it in an emulator like Bluestacks on PC and use it like that with fewer worries. That being said lemme make sure that's the right url you linked

Edit: the official website listed in the app is https://www.livenettv.mn/. The github you linked may be someone elses clone of it or attempt to fake it. The 404ing website they have listed isn't the correct url for the app (or might be an old url)