Can we all agree that joining a 3v3 arena, dealing no damage, doing no healing, and leaving after 10 seconds is wintrading? If we agree on that, then why aren't the admins doing anything about it?
There's a group of wintraders who keep trading wins with each other while deleting their characters after each session to cover their tracks. They've been doing this consistently for the past three months, and even after around 40 reports in game nothing has happened to them.
It takes less than five seconds to open the top ladder on the website, check their match history, and see the evidence. The situation has become critical. The admins need to wake up and start taking this seriously.

