I keep looking for a coherent answer to that question, but have never seen one so far, these are unimportant details that are swept under the AI enthusiasm rug.
Someone (I wish I could remember who) once argued that if you're trying to create an ecosystem around your product, you can't hoover up all the value, you have to leave some for the little guy. I've felt for a while that Google, with its various attempts to put the answer on the search results page, might be skirting dangerously close to that problem. It feels like the only value they're leaving on the table is the chance to sell stuff.
My expectation is "not much", because if the fact is utterly divorced from the source, there's not even any point writing near-spam pages to attract people to the site where you're selling something. But I think we'd need to see a working implementation to know for sure.