I add some, never trust about giveaway, airdrop, bounty or anything about freebies from email. Most of them are scam and the email will give you a link.
Just don't click it and delete the email directly.
Of course, there is no such thing.as free lunch. And if something looks and sounds too good to be true, it isn't. Scamers always have new inovative ideas and always find victims because people are naive and greedy. Always be careful, think twice and use your brain and common sense to evaluate situation. Don't expect that someone else will protect you from scam.