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Ads are not the only challenge. Cost-per-query is also a challenge, as an LLM query is 10x more expensive than a search-index query.

Is that all? I hadn't thought about that aspect, but I find it a little surprising that, even just considering post-training, it isn't more expensive than that.

I would assume (at minimum) 100x, but have not done any napkin math.

I'm pretty sure Perplexity attempted to place ads within their responses but had a large backlash.

I worry that LLMs will subtly sneak in commercial bias in return for money.

ChatGPT just announced embedded shopping. Sounds like another name for ads to me.