Edit - the exact message is "Because of its privacy settings, this video cannot be played here." I'm guessing it's geo-locked.
It is because you turned off sending a referrer in Firefox (network.http.referer.XOriginPolicy in about:config).
The video is domain blocked, meaning it can only be played when you are on a specific domain. Because you disabled referrers, vimeo doesn't know you are on hackcur.io so it thinks you are opening it through a direct link.
I don't know. Charisma and looks are pretty much orthogonal, at least for some people. The canonical example is Hitler, somebody whom you'd think people would instinctively avoid at work or the neighborhood bar, yet who somehow ended up running Germany.
It never hurts to be hot or handsome -- would a young Donald Trump who looked and sounded like Hitler have gotten very far in life? -- but it clearly isn't an absolute requirement.
I disagree. For example, if you're made up gorgeous and this leads a security checkpoint guard to notice you, and then they're checking you out and realize that your shoes are unusually fashionable, and then they notice that your badge lanyard is the wrong color and your badge looks a bit crinkly, now your cover is blown — all because you drew their eye.
That's not to say that there is no value in attractiveness — it's just not a guaranteed upside that can be taken for granted as harmless. This also shows up in spycraft, where "unmemorable" can be a very strong asset.