The problem is that it isn't stolen, counterfeit or anything if the sort.
Buying on sale is perfectly legal. On top of that, in this case, they also banned keys that the publisher sold directly to a reseller, not a reseller that bought it on sale pretending to be a regular customer. Granted, they are going back on that and it was largely a mistake, it just shows exactly what's wrong with all this.
The fact is that if a key is sold by the publisher and ends up in my possession, and I activate it and it's valid since it was bought legally and is an official key, then that's the end of it.
They shouldn't get to have a say in the transactions along the way. The whole reasoning for it is petty excuses. It doesn't matter the effects, they can find solutions that don't associate massive risks with using second hand shops for fuck sakes.
You know that bullshit where if you buy a second hand Tesla, a bunch of the software stops working even though it has a lifetime membership since its associated with the person and not the car, this is the exact same kind of bullshit.
We should be able to turn our games into keys whenever we want and trade them with friends ffs. Why are you advocating for taking keys offline just because of who's hand it went through when they were bought perfectly legally?