not quite sure what the scam would be given we don't want money. Or information. Or anything.
Not strictly true. You're collecting email addresses on a weird site, which I'm not comfortable providing. Your websites (why do you have two?) also list an e-book, marketing packages, and publishing services for sale.
Incidentally, I don't trust giveaways in general, I definitely don't trust "no strings attached", and it bothers me that Konami probably has a copyright claim against one of the games you've retweeted recently. Also, your Twitter account is ten years old with 30k followers, but I can't seem to find any information about you online. Who are you? What's your history?
I'm not saying you're up to something, I'm just saying there's no verdict 'til we know you. Since your expertise is in marketing and brand awareness, you definitely won't be surprised by skepticism.