That wouldn't work, popular browsers like Chrome pin the SSL certificate for Google domains (see for instance https://www.imperialviolet.org/2011/05/04/pinning.

That wouldn't work, popular browsers like Chrome pin the SSL certificate for Google domains (see for instance https://www.imperialviolet.org/2011/05/04/pinning.html https://www.imperialviolet.org/2011/05/04/pinning.html), so the homepage would just show an error message (IIRC when the certificate is pinned there's no button to ignore the error). The most probable explanation is that it's a "transparent" proxy which MITMs everything, and the original poster used youtube as an example.