Daily task dry spell

I doubt they went into any level of complexity with how things are picked. Only being able to skip one a day there is no possible abuse. In all likelihood it is a relatively flat fixed chance for each option to be picked each time. With a large enough player sample base and detailed tracking of what they get over the course of months could indicate with an acceptable margin of error the chances. This of course assuming those chances are not visible to someone looking under the hood.