I know, sergej went downhill, but he is still the best player they ever had. As Richard Lewis (Who I rarely agree with) said , something must have been very off if their star player chooses military (salary) over esport (salary).
This is not the first time he´s having a motivational problems and have to take a timeout from the game because of that as a professional player.
Military in Finland is mandatory at the age of 18, if you don´t have a really good reason to postpone.
Everysingle one should forget the military. It's not the reason he "left" - he left only because he has motivation problems and he wants to use his time well and fullfill his service during his break.