Except that making vague accusations about large companies without evidence is possible more problematic than making them about people (which we get all the time now already). Companies can afford lawyers, and lawsuits for libel, even if not successful, will put a strain on a paper. If a paper is getting a double negative hit from an article, both in loss of reputation (if it has any left) and in legal fees in defending itself from libel, then it may be less willing to publish crap.

Of course, a well researched and written article will defend itself, and the last think a company that really has something to hide wants is to go to court when there's unflattering things that can be proven, not just reported.