In the context of free accounts, "extra quality" is merely a marketing trick. The account might come with workshop mods pre-downloaded, but this does not change the risk profile of the account itself. The security of the login credentials is often compromised, making the "extra quality" entirely irrelevant if the account is banned or stolen within days of use.
While the game itself costs $9.99, you can use legitimate workarounds to avoid paying out of pocket. Steam Subscriber Agreement free steam accounts with gmod extra quality
Q: What are the risks of using a free Steam account? A: Risks include scams, account bans, and malware. In the context of free accounts, "extra quality"