Well, I have been in big companies where it takes a lot of time for the legal department to check those things. Not because it's fundamentally hard, but because the queue of things they have to do is pretty big.
> They thank them for their "generous insights". That's not the same thing.
Sure, it's wrong. But it's not "purposely stealing without giving any credit at all" either. It feels like an engineer did that, tried to give credit and did it wrong. And now we go on and on saying how this engineer is evil.