The survey seems flawed. I think you misunderstand the term collusion. Mining unobserved hands has nothing to do with collusion.

Collusion has to do with people sending you signs on a hand in progress allowing you to know for a certainty things you shouldn't know about a hand.

Datamining is about getting stats on old hands giving you numbers that hint at player behavior in the future. You don't actually know anything about a hand in progress.

I'd be perfectly content if all sites disallowed mining uobserved hands, but I think on the scale of things to be concerned about, it's pretty darned low.