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/2070080422482977095With 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 what authors and artist felt". https://x.com/PriyRanjan96/status/2070204156703568377There are several claims of: Copying UI is Ok, your product is not undifferentiated enough.Here is a legal assessment of the situation: https://x.com/jessebradner/status/2070492879718350986