The green gibus isn't a clan, or a guild, or a badge for some esoteric group. It might be a gang sign, and it definitely is a lifestyle. The green gibus is for those who want more from life. Who live life on the edge, and who like the colour green. Members have green gibuses, which they wear with pride. Or shame, depending. Sometimes they don't wear them. But they have a green gibus, just in case.

When you're worried the enemy won't be able to spot you? Green Gibus.
An enemy sniper will have trouble hitting your head? Green Gibus.
You aren't fashion aware, but you want to look good in-game? Green Gibus.
Red just isn't your colour? Green Gibus.
You want to blend in to potential jungle-themed maps that might be released in the future? Green gibus.
Want to troll people into thinking their monitor suddenly has stuck pixels? Green gibus.

The green gibus is the solution to the world's problems. It's here to stay.