If the guy wants to concede the match without going through a bunch of fakery, let him. He deserves the L, does indeed take the L, and has to live with it. The winner moves on risk-free. We miss 1 desired match in the early going, BFD.
I’d be way more bothered if a guy faked a match, giving the appearance of throwing it. Then we’re left to suspect the worst (shenanigans that actually do cause irreparable harm to the sport).
