I don't think this argument has any legs. You request a page from a web server, the server gives you back some html and some javascript, you execute the javascript which detects if you are using an adblocker. There is no tracking involved, if you believe the js you got back is spyware you can refrain from running it and you can't watch the vid. Should every website ask for your consent to serve you javascript now?
> Should every website ask for your consent to serve you javascript now? Ideally, yes.
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Turns out that youtube also has:
1) the dominant browser;
2) the same interests as, multiple partnerships with, and very little actual competition with the company that runs the next biggest browser in a walled garden, and
3) been completely funding the development of the browser that continually press releases as if youtube's aims are pure evil and that they are the only opposition.