Dota2.com schrieb:

Don’t let the blood, sweat, and tears you’ve poured into Dota 2 go to waste: protect your Steam account with a Steam Guard Mobile Authenticator. Get it now and take advantage of a sale in the Community Market. Plus, you’ll be able to avoid the new trade holds on unprotected accounts which are being put in place beginning Dec 9th. Learn more about the Steam Guard Mobile Authenticator for iOS and Android.