In the help tab on graal it says to not give out any personal info including email adresses. That message is out there and people who are willing to take the risk and get scammed, is all on them assuming they knew not to do it. But that shouldn’t be a barrier for account transferring if scamming is the biggest concern here. That’s completely on the player its just simply dont give your info. There are many ways this can work in terms of confirming you own 2 (or more) accounts.