Startpage person, here. Startpage doesn't collect user personal data so it wouldn't share it because it doesn't have it.

From Robert Beens (co-founder and CEO): "In no way does System1 want to change the privacy practices or process by Startpage, in fact, they legally cannot as all of those decisions are held by the co-founders of Startpage."

And,

"System1 is interested in Startpage's ad revenue, not its data"

Source - https://www.computing.co.uk/news/4017337/privacy-focused-sea...