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I hope BCT disallow Airdrop/Bounty thread that require email. Because i see some Airdrop/Bounty thread require email.
I don't think it will happen, campaigns have their rules and not moderated. If people don't want to give their email address, then they are free to not join the Airdrop/Bounty that requires it. It's just a choice imo
In addition, if you received an email from an unknown sender, especially about giveaways or something like that, it would be better to ignore it and mark as spam.