Ok and how do I know that the words they show me on the screen are not then compressed at a later time to a smaller subset then saved and used on my device?
The point is that once the basic diligence and product go out the window you open a can of worms. You are right that people should try to verify dice rolls if they can but the point remains that poor stewardship and diligence of the code is a problem all the way down and on some level you have to trust that the tool they made does what it says.