> it illustrates what Google intends to do (stop providing the service via an anti-adblocker script) if you do not follow their TOS.
Yes. They have complete discretion over what 'list of "things" and their URLs required to render a page' they decide to send any particular user agent (modulo copyright infringement, hate speech laws, etc.). There is no requirement that HTTP connections to 'youtube.com' should receive video data; or even HTML; or even that anything's listening on that port.
Yes. They have complete discretion over what 'list of "things" and their URLs required to render a page' they decide to send any particular user agent (modulo copyright infringement, hate speech laws, etc.). There is no requirement that HTTP connections to 'youtube.com' should receive video data; or even HTML; or even that anything's listening on that port.