Yes, they seem to work for many people. I don't mean to belittle that, I guess that is good. But, I'm not sure how that's interesting because "something works for somebody" is true for just about every category.
For example, some people want to work at Palantir and find it interesting that some executive named Steve Cohen runs the AC at 60 degrees and eats ice cubes all day to aid cognition[0]. There's a very wide diversity of people out there, so the fact that some find this appealing is not interesting or surprising.
So, the question, in my mind, is less that something works for somebody, and more about the broader meaning of this civilizational function.
[0] https://nabeelqu.substack.com/p/reflections-on-palantir (https://news.ycombinator.com/item?id=41855006)
An 11% drop isn't "something works for somebody," it's "it works for a lot of people, substantially more people than it harms, making for a clear net gain."
In individual with odd habits is a completely different thing. That comparison is utterly inapt.
If you had an entire population that started running the AC at 60 degrees and eating ice cubes all day, and cognition measurably increased by 11%, that would be incredible news.
Can you explain what your point really was then? Belittling the idea of hotlines seemed central in your messaging and the possible exploitation of data more of a secondary thing.
It's fine to be cynical but it's also good to remember that there are real people that do care and try to improve the world as well.