Steam tracks hardware IDs. If you frequently log into stolen accounts, Valve may restrict your ability to create new accounts or trade from your primary IP address.

Most sites or individuals offering "free accounts" are attempting to steal your personal information or hijack your existing account.

Downloading "account generator" software almost always infects your PC with trojans.

If the account has Steam Guard enabled (and you don’t have the mobile authenticator code), you might be locked out immediately after login. Worse, attempting to bypass it flags your own device.