alt Hacker NewsI was previously at Uber. I can imagine that the culture at some of these companies is toxic enough that people may openly discuss or even brag about some of these things.
There is also a good chance that this person only has 2nd and 3rd hand information and much of the post is only partly true.
Re: 100% of tips going to the driver
I have heard that many of the services are required to at least pay minimum wage. Let's say that this is $20/hr. If they receive $15 in tips during that hour, the company reduces their wage to $5. Driver gets $20 for the hour, $15 in tips, $5 in wages. Yes, 100% of the tips goes to the driver. No, the driver isn't economically better off depending on your tip, unless you are a very generous tipper.
In California, there's AB578 [1], which makes that practice illegal. The poster's algorithm (set the wage before the tip, based on the predicted tip) seems like it might be an attempted workaround for that law. I think it adds credibility that the poster has insight on that algorithm, since they aren't claiming just the publicly known offsetting tactic.