From the very link your HN submission points to:

> Research and Development: $19.18 billion. Loss from Operations: $20.92 billion

OpenAI isn't profitable even if you discount R&D entirely. Google search on the other hand has had ridiculous margin from the beginning, allowing the company to be highly profitable while financing significant R&D investment. These two businesses models are as different as it can be.

If ads were the solutions for profitability these companies would have used ads as their source of income from the very beginning.