[dimitrios1]

As another commenter here has mentioned, in the case of LoL particularly, Riot games has banned similar apps and tools in the past. I can also see it causing "integrity of competition" issues with people, although you can certainly get live streamed coaching with professional coaching, that certainly isn't as scalable as simply running a coaching app alongside your client.

[nwsm]

Blitz [0] gives an overlay with info like creep score in League of Legends, and character suggestions in Teamfight Tactics.

[0] https://blitz.gg/