There is nothing "brilliant" about this. People just like seeing smarminess, particularly if it's directed at a "big evil corporation". Frankly I thought the guy's response was douchey.
1. He complied with the order
2. ..while gaining an enormous amount of press
3. ... and generating more revenue
If enormous corporations are going to lawyer after tiny business, it's awesome for said businesses to use PR-judo to leverage the attention into something positive.
[Edit: My more detailed thoughts on why this is completely acceptable in a top-level comment here: https://news.ycombinator.com/item?id=6995479 ]