Because I'd want to add a list of excluded sites for pretty much every single query I do. Would you want to type out a string of 20 or 30 excluded sites every

Because I'd want to add a list of excluded sites for pretty much every single query I do. Would you want to type out a string of 20 or 30 excluded sites every time you search Google? Ranking clearly isn't going to be good enough, because algorithms can be worked around and gamed.