You stay on the same site. It fetches the video for you from the other server. For example with this URL: https://kraut.zone/w/aWCVkSQTXKJ1yuR6o8zjDY https://k

You stay on the same site. It fetches the video for you from the other server. For example with this URL: https://kraut.zone/w/aWCVkSQTXKJ1yuR6o8zjDY https://kraut.zone/w/aWCVkSQTXKJ1yuR6o8zjDY Kraut.zone is fetching this guy's vlog from his personal server. But you don't need to visit this random guy's site yourself or run any of his JS in your browser. But if you are really concerned about security you shouldn't even be using JS in the first place. "Le Walled Garden" is not an exception.