Why is youtube blocked?

I opened my silk browser. One of the tabs I often have up and ready at opening is to some music video on youtube. A few days ago, it refused to open saying it was unavailable and that youtube had given an invalid response. It also includes a red reload link, which does nothing. I have tried clearing cache. I have dumped tabs with youtube and attempted entering through youtube's home page. The resulting error page is IMMEDIATE. There is no pause, the processor doesn't have to think about it, the address does not require time to resolve or load. This would indicate to me that the site is blocked for some reason by Amazon. I make this statement because my wife's older Kindle HD responds in exactly the same way. So the obvious question is: What the he** is going on here, and why? Anyone know what's happening and care to enlighten me?