Its algorithms (because there are multiple Full Page algorithms) seek to shape the ideal user experience for these auctions. When it receives winning bids for rich elements, the algorithm may choose to eliminate them. So even a winning bid can be rejected.
There are several reasons I can think of to eliminate a rich element that has Darwinianly "earned" a spot on the SERP:
It doesn't really meet the user's intent.
Another rich element is more suitable (a Q&A / featured snippet can be discarded in favor of a knowledge panel, for example).
The SERP would become too cluttered.
The SERP would become too long.
It would harm the profitability of the SERP.
My idea that pure Darwinian logic would work wonders and vietnam phone number data create the perfect page turned out to be naive. “Darwinian elimination” is also part of the game and contributes greatly to the final choices.
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One question that Illyes didn't answer (but in his defense, I didn't ask him that question) would remain: "How do you decide where each rich element is ranked/positioned on Google's SERP.