I see the headlines. I understand there are companies that offer this as a service to LEO. I believe the data would need to be de-anonymized to be useful.
Who or where can I source data like this from?
https://www.oag.ca.gov/data-brokers
De-anonymization shouldn't be that tough if you have the cash to pay for a handful of data sets that you think are likely to contain overlap.
I'm not aware of anyone selling person-level location data. Everyone in the ecosystem is far too scared to do that (and honestly not clear how to monetize).
It's all about foot traffic patterns and getting demographics, seeing what kind of other businesses they visit, etc IME. General location business analytics stuff.
This is the article I am building my hypothesis on. If I am able to correlate place of business with an out of town event like a conference and then further refine with gender and ethnic filters.
I understand that companies will perform this analysis on your behalf. Can anyone recommend a "reputable" one?
For research I dunno. You'd probably have to make a deal directly with one of these companies, one way or another, so I would start by talking to them.
[0] - https://www.vice.com/en/article/nepxbz/i-gave-a-bounty-hunte...