In this context, “verified” is a deceptive marketing term. It usually implies one of the following:
If you've been searching for a "verified free Steam account with Garry's Mod (GMod) verified free steam accounts with gmod
It’s a masterpiece of user-generated content. By paying even a small amount, you support the developers (Facepunch Studios) and ensure the game’s servers and modding community remain vibrant. In this context, “verified” is a deceptive marketing
The original owner can reclaim the account at any time via Steam Support. In this context