@kaia https://store.steampowered.com/subscriber_agreement/

C. Your Account

When you complete Steam’s registration process, you create a Steam account ("Account"). Your Account may also include billing information you provide to Valve for transactions concerning Subscriptions, Content and Services and the purchase of any physical goods through Steam (“Hardware”). You may not reveal, share or otherwise allow others to use your password or Account except as otherwise specifically authorized by Valve.

> You may not reveal, share or otherwise allow others to use your password or Account except as otherwise specifically authorized by Valve.