Because a lot of players are still playing GOTM 138 and/or 139 this GOTM (140) will start next month instead this month...
I am not sure what game.txt is but rules.txt cannot be changed.
If the changes do not give you any material advantage in gameplay then they are ok.
From CFC :
"FOR CIV2 GOLD ONLY! This is an improved version of the civ2 multiplayer civ2.exe program. This new version allows you to :
Generate random maps of 32'767 squares instead of 10'000.
To have more than 320'000'000 people.
To earn more than 30'000 gold."
Is this any real material advantage ?