The device is a Google Chromecast with Android TV.

Every day when I look at my Watchlist, that movie from a service I've never heard of before this is added on top. No one else has access to my Google account (verified logged in devices, changed passwords, have a MFA key). No one else has access to my apartment. Yet every day, Cargo is there. It's always that specific movie from that specific streaming service, and there's no record of it ever having been added.

Is this some messed up advertising thing they've done where they replace your Watchlist with yet another place to put ads and suggestions? I'm at a loss, and the Google Support felt like they thought I was full of crap when I tried to get official support for this bizarre issue.