Earlier quoted context omitted.
They want to know how the algorithms work, not the data itself.
Google doesn't know what the algorithm is anymore. The whole site is a black box.
I'm not saying that to defend anyone BTW. This complexity and opacity (which is transitive in the sense that a combined result including even one opaque part itself becomes opaque) is very much the problem. What I'm saying is that it's likely impossible for the companies to comply without making fundamental changes ... which might well be the intent, but if that's the case it should be more explicit.