Place the same requirements on Interest as on Join
Currently, any player can express "Interest" in a game, even if that player could never actually "Join" the game. I believe the definition of "Interest" should be clarified. Currently, it appears to be "I'm interested in seeing this game run", but I believe it should be "I'm interested in playing in this game".
Most recently, this allowed a player into the Cancer war (a Championship game) with a low Tenacity, even though there's a Tenacity requirement of 100 on that game.
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Whisperer commented
This also frequently allows low-rank players to push a game with a high-rank requirement into the Joining state. This causes the game to take longer to actually fill.