I know that some of those emails could be real, but I don't have time to verify which is real and which is not. I totally avoid them all. For me to receive a mail from Coinbase and Bingx on the email that I have not registered with on Coinbase and Bingx makes me believe that it could be a scam. Even on the email that I used to register at Coinbase, I did not receive any mail from Coinbase regarding Halloween or any giveaways, although I received from Bingx.
Guys, kindly be aware that hackers always like to take advantage of any slight opportunity they can get. They will be sending some phishing links to your email, asking you to claim a Halloween gift, and if you mistakenly tap on those links, you might be granting them access to your device.
Protect your bitcoin. Happy Halloween.