An account with a confirmed valid email address is required to play Don't Starve Together.
When you register your account through steam, we associate your steam account with your email address so that we establish an identity to somebody who is playing Don't Starve Together.
This allows us to do a couple things. Most importantly, it allows us to to ensure that people are who they say they are. This means that while people might have the same name, we can ensure that we know the Steam ID associated with that name. This allows server hosts to admin their servers appropriately. We consider this of critical importance to ensure that players have a great experience in Don't Starve Together.
Additionally, we will be providing perks and rewards to people who play Don't Starve Together, and to do this, we need to be able to contact you if required or send you critical information about your account. For example, if your Don't Starve Together account is granted new friend keys, we will need your email address so that we can send them to you.