Bro the thing about sinatraa is that Riot cares a lot about their image. They know very well how skilled sinatraa is and that if he joins any org he will be playing really well. Riot don't want that because if sinatraa starts dominating pro play then sinatraa will become the face of Valorant in NA (because that's how good he is)
And riot don't want the face of their game to be a sexual assault accused