Where Is the Line? When AI Search Becomes Advertising Disguised as Knowledge

Something is happening quietly, and almost nobody is talking about it clearly. In the age of AI search, advertising has found a new disguise — it's showing up dressed as knowledge. When you ask Doubao, Kimi, or DeepSeek,openai "which is better?", the "objective analysis" AI delivers might be content that was deliberately engineered by a brand. This isn't a conspiracy theory. It's the result of a strategy called GEO — Generative Engine Optimization — being systematically abused. Advertising is a drink. Knowledge is clean water. The problem is that someone has started pouring drinks into clean water bottles. And when you drink it, you can't tell the difference.

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