Just as how the game registers when you join a losing match, lose the match, and you do not lose valor points... It should register, when people back out during a competitive match, that the team who are in a 1v4 2v4 or 3v4 disadvantage, will not lose glory points. In theory, will bring back others who do not play competitive anymore and it will become a better experience.
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As I'm reading replies there seems to be a loop hole (kind of)... To avoid, people creating alt accounts or being in a 4 stack team to just back out (cheating) in order to proc the "no glory points loss". To add to my "suggestion" equation, rule a "NO CONTEST" once the match becomes at a disadvantage. Match ends immediately. The "NO CONTEST" will probably happen a lot but eventually, it will stop people from backing out on purpose.