Sorry, but I was outraged by reply above me because it was completely misleading. I had to react.

As of question
I'm going to react because of option (b).

To me it's pretty clear. Why would casino bother implementing something that could negatively affect their profits when it's users don't require such thing.
Once players realize provably fair concept exists it can be game changer but first they need to start complaining (or stop playing). Apparently this is not happening.
In addition casino must be sure the lost profits (due to people stop playing their unfair games) exceeds lost profits due to offering actual fair game. Unless this condition is met, there is no will to change anything.

BTW I fully agree with SyGambler post.