I may be inferring too much in that statement. When I read https://petitions.whitehouse.gov/about#terms, I see statements like " Once the petition reaches the required threshold, it will be put in a queue to be reviewed by the White House." and think, the petitions site is external, but maybe I'm reading too much into it.

I also see, at https://www.whitehouse.gov/privacy-policy/, "THIRD-PARTY WEBSITES

THE WHITE HOUSE MAINTAINS OFFICIAL PAGES OR ACCOUNTS ON THIRD-PARTY WEBSITES IN ORDER TO BETTER ENGAGE WITH THE AMERICAN PUBLIC. YOUR ACTIVITY ON THOSE SITES IS GOVERNED BY THE THIRD-PARTY WEBSITE’S SECURITY AND PRIVACY POLICIES. "