So, if this is true, OpenAI needs much better conversion rates, because they have ~15 million paying users compared to 800 million weekly active users:
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If they insert stealth ads, then after the third sponsored bad restaurant suggestion people will stop using that feature, too.
Hell they could even just add affiliate tracking to links (and not change any of the ranking based on it) and probably make enough money to cover a lot of the inference for free users.