The Capitals nor the league provided any reasoning as to why Kuznetsov is entering the program, as is entirely his right. In a statement from the NHL, the league said that Kuznetsov will return to hockey once he is cleared by the program's administration.
Kuznetsov will mark the 7th player to enter the program this year. It's a noticeable uptick in the use of the program, and it's amazing to see players beginning to open up to the resources available for off-ice issues. Hopefully Kuznetsov gets the help he needs and can be back on the ice soon.