Just stay away from clicking that links because you do not know if that is safe.
Unless the owner of Nitro Betting himself invite you and give the code, that is still suspicious and better to leave it or delete it from your Inbox.
Besides that, we do not know if we can trust him as we have already met many people who have a bad intention to do something to us.
So how is your progress in finding a casino to gamble? Did you already found the right gambling sites that you can access without a problem?