Definitely one hell of a way to mas collect emails from the cryptocurrency demographic. They could just simply shut down the website at the end of 2019 and they would end up with a good sized email list. Regardless if this contest is actually legit or not, I definitely suggest using burner emails. There's a good chance that the people who submitted their email addresses would be spammed with articles, or worst case scenario, the email list would actually be sold to potentially people with malicious intentions.