What about others? I'm fairly certain that Google & al. are no better. That is, they have this massive data trove but have not figured out how to do anything u

What about others? I'm fairly certain that Google & al. are no better. That is, they have this massive data trove but have not figured out how to do anything useful with it beyond basic demographic profiling which they still get wrong a lot of the time. They may have even regressed, or moved away from personal results, because my search results in the past were geared more towards my interests. Supposedly, (physical) location, query, and queries sent right before are the relevant inputs Google uses. Perhaps ads retargeting/tracking also works to some degree.