Stacking the Deck beforehand won't lead to a legitimate win in Poker...
...so why would it be a legitimate win in League?
I've yet to actually see a genuine win for years. People rely so heavily on both premade and smurf matchmaking manipulation in order to make a game in their favor, that there is virtually no point trying to compete or believe that this game has any semblance of dignity left.
League used to have genuine wins, wins where both sides were evenly matched, both with the same limited communication because there were no premades in it. Games where Riot's ban system had not pushed all the toxic players to the bottom so they can just create new accounts and Riot can make money off them but at the same time drive new players away by smurfing.
I am beginning to believe that Riot simply does not care about their games integrity because they have brought in so many ways to stack the deck before you actually even get in the game now.