You don't need to share your primary account, you can theoretically apply for the job with a secondary, or none.
This isn't exactly strict separation of personal life, you are basically working at a specific venue and playing at that same venue just without your uniform; people know and you won't last long in similar situations elsewhere either (unless you're maliken/s2 games)
So, are you saying that once they acquire a company provided account their personal ones are no longer audited? That doesn't seem to be the case at all.
[1]A random job posting from Riot http://www.riotgames.com/careers/10838
"While our engineers come in all shapes and sizes and work with many technologies, we expect every engineer at Riot to be:
Player-focused: you’re a gamer whose passion for games (especially League of Legends)"
Almost all of my friends there have separate personal and work ("Riot<username>") accounts, the latter at the very least requires you to set a good example as a company representative