[soundwave106]

Based on a comment wesd linked to above (https://news.ycombinator.com/item?id=18535748), and applying that comment to all the large corporations behind ad-tech (because IMHO large corporate political problems are fairly similar no matter where you go)...

It seems like for these systems, there are often multiple teams developing the algorithms, with multiple algorithms in play behind the recommendation. Each algorithm has their own style of metrics system. Some of them are probably relatively simple with not very sophisticated AI/ML (or even no AI/ML at all) behind it. And, there is a lot of internal political conflict preventing better analysis of said algorithms to refine them.

In other words, you're absolutely right.