Not all Challenge lobbies are fake. Challenge lobbies are real. There are known people that can do it such as CodChills. Even some not known people do it and are trusted. Challenge lobbies are released to the public, but are only recovery lobbies. Online Challenge lobbies (Private Match) are mostly fake (99% of the time) but there are some people who can host them. Ask for proof on YouTube for a video or something. If they don't show legitimate proof, DO NOT give them your account or any other info, Subscribe to their YouTube, etc. You will be scammed. Spread this around and help others.

~Jonah