In this case always happen in airdrop program which giving us big rewards and many benefit with join into their presale sh*t token, when they feel getting target value for scamming people they will walk away. Sadly it happen to me once in 2 years ago. Or maybe just for rake in a lot of dozen people's into their channel for referral programs and channel marketing interests for their benefit. This case often happens on telegram airdrop and twitter airdrop.

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