What I can only tell is that they are fake if they manage to have thousands of Telegram members in just a few hours. It means that they have done this before and they know how to scam. Also, majority of airdrops were scams and just want to get info or ID's for KYC. You need to be aware on what you were joining or better yet, don't even think about joining as its not giving out high rewards. Its not worth the RISK.