The footer copyright declaration at the bottom of the page
is in lower-case (completely). I want to know if there is some particular reason for this? Why is it not Titled-Case or Sentenced-case?
As Jeff says here: (in a highly unpopular response)
Consider the copyright declaration:
That's indeed not a full sentence. It's not "This site was designed by...". As a declaration only, it does not get treated as a sentence.
While I personally does not agree with Jeff reasoning, that's most likely the reason.