The US also has outsized influence in this arena due to the USD being the world reserve currency. Which isn't to say that might makes right, but it's easier to get your way when you can dictate the terms by which banks and nations can interface with the global economy. The British pound doesn't have quite the same level of soft power, so it must be wielded more strategically to avoid completely losing that which it still possesses.
I don't imagine going after Imgur would be a worthwhile exercise of that soft power.