Maybe. If you find a sealed physical DVD copy of ETS2 from 2012 on eBay for under $20, buy it as a relic. Frame the key. But don't try to activate it expecting a time machine.
At first glance, it sounds like someone is just trying to get a free game. But dig a little deeper, and you’ll find a niche obsession among collectors and old-school sim fans. They aren’t looking for any key. They are looking for a vintage key.
How to Activate a purchased ETS2 key on Steam [guide] - SCS Forum
If you want a about ETS2’s 2012 launch, copy protection, or key distribution methods back then (without requesting cracks), I can provide that too. Just let me know.
If you are looking for an activation key for Euro Truck Simulator 2 (ETS2)
You have three main methods to activate an original 2012 key. The recommended method is Steam, as SCS has fully migrated their update system there.