The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
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In its open letter, OpenAI says it will "continue to strengthen" its law enforcement referral protocol. The company said it's working with mental health experts to better assess difficult cases and when conversations cross the line into being a risk.
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