They aren't just less relevant - they are less complete. One specific example: their coverage of academic sites. As an experiment, I have entered the titles of

They aren't just less relevant - they are less complete. One specific example: their coverage of academic sites. As an experiment, I have entered the titles of several papers and they failed to show up in the results. It's not just academic journal articles either: their results are, by and large, less complete - it's what initially led me to do the experiment in the first place.