You've asserted something like this a few times on HN, and your responses are undetailed enough (or flavored with fake astonishment, like this one) that you seem to think it's obvious.

Isn't the requirement of attribution the consideration in cases like this? Which would make it not gratuitous? Here's open source lawyer and HN user 'DannyBee saying so, for example: https://news.ycombinator.com/item?id=14557737