This exact thing happened about a decade ago, when someone released a tool called Serenity that allowed you to spoof your SteamID using recorded tickets. It was

This exact thing happened about a decade ago, when someone released a tool called Serenity that allowed you to spoof your SteamID using recorded tickets. It was especially chaotic for the Garry's Mod community, since most servers have admin tools gated behind SteamID checks.