It's not random. I vote on every post any author in my author list makes, except where the bot misses the post because of network latency or other technical glitches.

It is very much like an employee/employer relationship. In a good relationship, the employer (roughly equivalent to myself) trusts that the employee (roughly equivalent to the author) will produce good work. I simply do not feel the need to approve all posts of the people in my author list before they post.

If this were a news magazine or other publication where the relationship is a little different (say, where I'm the editor), I'd probably do it a different way. But I have no interest in imposing my approval on everything an author produces.