YouTube fell? Or one percent problem

The second day there are problems with watching videos on YouTube.
News aggregators have already dubbed this “large-scale failure” - Large - scale failure of YouTube .

Some suppose that this all-seeing “Roskomnadzor” has blocked something there, and not to watch us more than our favorite cats :)
')
It became interesting (besides, the problem was observed yesterday). I decided to dig a little.

Everything turned out to be commonplace - the problem is in percent . Yes, just one percent does not allow us to watch our favorite vidosiki.

Before some videos inserted advertising. And one such video (at least) kills the YouTube player.

How did you find out by the minified code :

function(a,b){return a?b?(0,window.decodeURI)(a.replace(/%25/g,"%2525")):(0,window.decodeURIComponent)(a):""};

— ( , ) window.decodeURI.

(20%).

__/%D0%9F%D0%BE%D0%BB%D1%83%D1%87%D0%B8%D1%82%D1%8C_CashBack_20%

«URIError: malformed URI sequence».

— .

Google!