r6---sn-8xgp1vo-a5ml.googlevideo.com is not a typical website. It's a subdomain used by Google for video streaming and CDN services. When you visit it directly, you get a 404 error, and search engine crawlers are blocked. This is normal behavior for such a backend server, not a red flag.
Because it's owned by Google, there's no real question of trust in the usual sense. The domain has valid encryption, no blacklist hits, and no security warnings. If you see this domain in your network traffic or logs, it's almost certainly legitimate traffic from YouTube or Google video services.
There are no contact pages, privacy policies, or social media links because this domain was never meant for public browsing. The absence of those features isn't a concern here. In short, r6---sn-8xgp1vo-a5ml.googlevideo.com is exactly what it appears to be: a piece of Google's infrastructure, and there's no reason to distrust it.