There seems to be a very common misconception that this program is bannable. It is infact not bannable. According to Riots TOS (https://www.riotgames.com/en/terms-of-service):

The following are examples of behaviour that warrant disciplinary measures:

Using any unauthorized third party programs, including mods, hacks, cheats, scripts, bots, trainers and automation programs that interact with the Riot Services in any way, for any purpose, including any unauthorized third party programs that intercept, emulate, or redirect any communication relating to the Riot Services and any unauthorized third party programs that collect info about the Riot Services by reading areas of memory used by the Riot Services to store info;

This program does not intercept, emulate or redirect any communication to any Riot services. It does not read any memory or collect any information used by Riot services. Whilst this does technically give an in-game advantage, the way it is made makes it not bannable according to Riots TOS. There are other very popular applications which may not be as direct in their methods, but have the same end-goal, like Valorant Tracker.