To much risk of committing libel/slander and as your algorithm (and not your users) makes a conscious choice what to display you lose the common carrier status.
Sure, it sometimes throws up surprising suggestions, but people are starting to recognize that it just reflects the world out there.
And no the average civilian doesn't know anything about Machine Learning at all the vast majority woudl consider its Googles POV - Perception is everything as the Macpherson report pointed out.
Google wrote those algorithms which is the problem from a legal perspective.