After two nerfs to his major ability on April 19 with the release of Patch 13.8, Kayn has heavily fallen out of favor with jungle players in League of Legends.
The champion currently sits in 11th place in terms of junglers with the worst win rates in Platinum+ ranks, according to a League stat site U.GG. He has a poor 48.80 percent win rate, though it drops even lower in Diamond+ ranks, where Kayn has a disastrous 47.71 percent win rate, the sixth worst on the scoreboard.