The Care2Petitions site is a scam.

I am one of seven people on this site complaining about Care2 switching my petition from impeaching Pelosi to impeaching Trump. I sent a message to them and when I went back to the thank- you email it had been switched to an impeach Pelosi petition.
The link was originally from Law Enforcement Today, which is also flagged online as invalid. It sent me from there to whitehouse.gov, where I signed to impeach Pelosi, but the thank-you email came from Care2Petitions, thanking me for signing to impeach Trump instead. So apparently they are intercepting/hijacking the petitions and switching them to their left-wing agenda.
I hadn't heard of Care2Petitions
Until today. I don't believe anyone had a reason to misrepresent the facts, except for the one person who accused people of trolling.
I don't know why anyone would lie about the petitions being altered unless it was true.

Personally I don't think the site is legitimate, based on what another petitioner has said happens when the goal is reached - the petition isn't sent anywhere. The sponsored petitions may be more legitimate, but consider that those organizations paid money to Care2 to promote those petitions and members don't get butterfly credits for signing them (thereby saving Care2 money because they don't have to fulfill any obligation to redeem said BC for a donation).