None of the people in my circle have the same clan tags for a reason haha, people don't know whats happening till its to late. We just look like a bunch of randoms with mics. TBH we get just as many groups who back out when they join then randoms who dont know any better. I see what your saying but there is no way to make people stay in a game where they know they are at a major disadvantage. I wouldnt want to play a pro football team with a random group of dudes that I dont know.
People will always back out it just depends on how worried they are about their stats, cause you could easily check our win streak and connect us all together. Some clans/groups like ours prefer to play clans for the challenge.