Hi Alexandra! I do not think you need to find a more unique topic than this. In my successful applications and interviews last year, for basically every commercial news question I discussed the Inflation-High Interest Rates story, and I never received negative feedback for it - despite the fact that this was probably the least 'unique' story I could be talking about. I think what matters more for this type of question is not the news story you choose itself, but rather how you go about discussing it. Showing a real depth of understanding and a structured multi-faceted analysis of a big news story will be more impressive than a vague description of a more niche topic.
I don't think choosing the DOJ v Google case could ever be held against you - firstly, it is a significant recent development in a longer shift towards stronger antitrust enforcement which is particularly ripe from a dual legal and commercial analysis. Secondly, it will still be less commonly seen in applications when compared to topics like inflation and the economy, impact of recent and upcoming elections, and so on.
That being said, I do think it's good to always strive for additional specificity and to find ways to differentiate your answer from other applicants. One thing I would suggest here is to take some time to research and understand
Sidley Austin's specific antitrust practice and client base. Are any big name clients particularly likely to be afifected by the case? Is Sidley's antitrust practice especially well-placed to advise clients and to win mandates following this development? Does the firm have significant prior expertise with this type of case? If so, mentioning any of these details in your analysis will definitely help set you apart.