Many resellers require you to have a clean Steam account with a certain playtime or a non-limited Steam profile. Some require you to have an existing invite from a lesser-known cheat (like Fatality or Onetap) to prove you aren't a Valve informant.

: Invitation codes are only generated by the site's administrator (Esoteric) or, occasionally, by long-standing, verified members with high reputations.

Many "free generator" downloads contain keyloggers or ransomware that can compromise your entire computer.

Beyond the malware risk, there is a philosophical reason these generators don't work. GameSense is a . The developers invest thousands of hours into keeping it undetected. They need to limit user count to avoid Valve’s attention (VACnet). An invite generator would flood the market, leading to a rapid signature detection and the cheat dying within a week.