Am I being autistic, here?
Because, to my eye, this looks shopped as fuck.
Zoom in. Really look at it. The light on the poster doesn't quite match the light on the lettering - it's most obvious on the darker, right side of the poster, where the 'graffiti' intersects with the gold of the Harry Potter logo.
The 'dribbles of paint' are far too uniform to be actual paint dribbles from hurried graffiti, but just non-uniform enough to look like someone aping that effect for the aesthetic.
I also question why someone would use a dark colour on a dark background if they wanted to go for legibility. But you might do that if you were hoping to obscure poor quality shoopery.
My tinfoil theory here is that this Redditor did not, in fact, come across this graffiti today, but rather they saw the poster, got angry at being reminded Harry Potter exists but, being too pussy to do anything about it in real life and risk getting caught on London Underground's CCTV, opened up Photoshop and went to town, then posted the results to Reddit as a form of cope for their fellow trooners.
If I'm wrong, I am going to look retarded here, I admit.
