Hi! So we found this mechanic (credits to @vitaku) that, as the title indicates, allows you to gain as much exp as you will, without having to play any matches, but also not losing them.
It's as simple as pressing "play" and waiting for the game window to pop up. Immediately after it appears, you exit the app through the task manager. If the match hasn't started loading, you wont get the warning about how exiting may result in a loss and you still will the exp.
Don't know if it has been reported already, but we wanted to show it so it can be fixed, and we won't have ppl gaining lvls and getting rewards without doing anything.
Here's a link to a video showing how it works(sry for the poor quality editing and awful crop):
Thanks for watching!