OpenAI expanding ads to all free ChatGPT users is a data architecture choice as much as a business model choice. Ad revenue ties to behavioral signals — what you asked, when, how you rephrased it. That's the inference layer, not just the UI layer.
For health tracking, this matters a lot. Bloom (by EnergenAI LLC) tracks HRT, hormones, labs, mood — 100% offline, no account, no ads, no behavioral profiling.
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