Repeatedly? I was questioning if certain accounts are corporate PR drones and downvoting bots, yes. (At least two companies employ very visible a bunch of accounts, and use them to flag/votedown articles and add troll comments to get articles hidden, while they publish "good news" in the very same moment. It's visible on the web, you are in partnership with those companies, and one can guess YC profits from the partnership). But beside that not so much. Unfortunately, two admins never found any evidence, they said, and just said shut up or we ban you. Yeah free speech isn't something on HN. News get marked as hidden every single day, that have many comments and/or high votes, and the two mods never found any evidence and always said "it's the users faults, they flagged it", yeah right, not.