Your "search for knowledge" occurs through the portal of OpenAI's ChatGPT software, which is a consumer-facing product just like a commercial and just like customer interactions at a shop, and so if we (society / the law) do not question and regulate commercials and customer interactions in this way, then we also should not question or regulate OpenAI's system prompts, since these mechanisms are so similar.

If you want an un-influenced "search for knowledge", you are well within your rights to pursue that independently using your own model and software, but because you are accessing software developed by another company, these rights do not apply.