Linking to your game accounts provides a bit of security for other members of the community. It ensures you're a real person who is at least somewhat dedicated to the community. If you do not link to at least one of your game accounts, you will be denied full access to the community.
Is it secure to link to my game accounts?
Yes, so long as you do not share your login information with anyone. If you share your login information, you put all of your linked accounts at risk. You are also responsible for ANYTHING that occurs on your account, whether you have knowledge of what happened or not. Your account is your responsibility; safeguard your passwords to protect it.
Can someone else link to my game account without my knowledge?
Someone can attempt to link to your game account, but all attempts to link to game accounts must be confirmed via e-mail. This means that if you are the only one with access to your e-mail account that's associated with your game account, no one else will be able to link to it. In addition to this, game accounts may only be linked to one community account. This means that if you've already linked to your game account, no one else may link to it.
