The other day I pasted two links into ChatGPT, both different brands of the same appliance. One was $50, the other $200. I asked to compare the differences.
It ended up recommending and linking me to an entirely different one, that I hadn't linked to at all.
Don't know if it was just sloppy LLM "thinking," or a genuine ad.
The naive assumption would simply be it took up a prominent position in it's training data for arbitrary reasons. If I were some Marketing genius, I'd be asking the LLM makers if they need free training data and solicit brands to contribute.