YouTube videos taken down for hate speech? Seems new.

Is this new? Here's a video in question:

https://www.youtube.com/watch?v=yG9xMiFRQrs

It's of a French woman defacing a mural in Paris that said 'French women belong to African men' (to, 'French women belong to French men').

http://renegadetribune.com/french-women-belong-to-african-men-mural-gets-defaced-by-female-activist

a) Since when has YouTube prohibited hate speech?

b) This was far from hatespeech, more like a corrective - or, one piece of hatespeech being modified to another.

c) What can of worms has Google opened, putting the burden of deciding what hatespeech is, and isn't? Why would they be so crazy?