Quite apart from any content/copywrite issues, this wasn't a useful tool.
It was a badly-made tool that didn't identify anything valid or worthwhile. The measurement of passive voice is a particularly clear example: that's not what passive voice is at all, and anyone who understands passive voice knows that it shouldn't be frowned upon [1].
Right, but passive voice also does not render your assertions necessarily true, though it may be able to increase the likelihood of them being perceived as such.
It was a badly-made tool that didn't identify anything valid or worthwhile. The measurement of passive voice is a particularly clear example: that's not what passive voice is at all, and anyone who understands passive voice knows that it shouldn't be frowned upon [1].
"Just add tech" is not a recipe for usefulness.
[1] http://www.lel.ed.ac.uk/~gpullum/passive_loathing.html