Earlier quoted context omitted.
I mean that almost surely there are people that do so and carefully make sure to not mention that and make sure that their contributions are not derived work and don't have such "hints". The main technique to do so is "parallel construction": e.g. you reverse engineer a binary or look at source code, find out a special case not implemented in Wine, then construct a test case that tests the special case and behaves di…
What evidence do you have for this?
That’s like asking a spy for evidence of their current mission.
Does the spy’s denial of knowledge or a lack of evidence of that spy’s mission mean that individual was not a spy? Quite the opposite. It means they were an effective spy.