Ask HN: Is "no source code was copied" still a sufficient copyright defense?

We are all familiar with the Corgi event: https://x.com/mfts0/status/2070080422482977095 With the barrier to create new apps having dropped significantly thanks to LLMs, I am seeing more cases about copyright and unfair competition. I've seen and participated in some of these cases. Usually expert witnesses are required. Curious to hear the community stance on this one. "Now software developers are feeling wha