It is standard CYA terms to keep them from getting sued by their users whenever they decide to change the site in such a way that displays your content in a different manner than what you expected.
Every service you've ever signed up for that accepts user-generated/submitted content has a clause functionally identical to this.
Of course, every time someone reads one of those clauses they think it implies all sorts of evil, because reading comprehension is not a strong suit of the internet.
