From my reading, if the site only shows you based on your selections, then it wouldn't be liable. For example, if someone else with the exact same selections gets the same results, then that's not their platform deciding what to show.

If it does any customization based on what it knows about you, or what it tries to sell you because you are you, then it would be liable.

Yep., recommendation engines would have to be very carefully tuned, or you risk becoming liable. Recommending only curated content would be a way to protect yourself, but that costs money that companies don't have to pay today. It would be doable.