There is no legitimate "paper" or official source that provides free Steam accounts with Garry's Mod (GMod)

Garry's Mod is a sandbox game that allows players to manipulate game objects and characters. Developed by Facepunch Studios and published by Valve Corporation, GMod was first released in 2004 as a mod for Half-Life 2. Over the years, it has evolved into a standalone game, known for its extensive modding community and the sheer freedom it offers players to create and play custom game modes.

While there are many websites and videos claiming to offer "free Steam accounts" with Garry's Mod these are almost always scams that can compromise your device or lead to a banned account

Garry's Mod regularly goes on sale for as low as $2.00 to $4.99 during seasonal Steam sales.

No reliable, legal source provides “free Steam accounts with GMod extra quality.” Any site claiming otherwise is either trying to scam you or distribute stolen credentials. Protect your own Steam account – don’t log into anyone else’s. Spending a few dollars during a sale is far cheaper than losing your entire game library to a security breach.