Developers can generate Steam keys for their games at no cost to distribute for marketing, reviews, or external sales. This flexibility is exploited in several ways:
Never log into your Steam account on any site other than steampowered.com or steamcommunity.com . free random steam keys work
Most legitimate "free key" sites operate on a "GPT" (Get-Paid-To) model. To "earn" your random key, you usually have to: Developers can generate Steam keys for their games