I would mention hitta.se from Sweden. Probably a privacy nightmare to some, and very creepy to others. On the page you can search peoples home address, phone number, date of birth, other members living in the same house , real estate value, mortgage rate, all by searching their names. I successfully once identified a parent of a owner of a lost wallet, only containing a gym card with last name on it. Found her phone…
WOW. Is this a well known service/site in Sweden? In other countries this would have been blown up into a huge privacy issue. Assuming its not because its sort of underground, why do you think it hasn't in Sweden? Genuinely curious
I'm not well read on the issue but a lot of things are digitalized in Sweden. It's a cashless society, where everyone have a personal number that they can use for government service & signing up for phone contracts. The tax institute (like USA:s IRS) sends their deductions out digitally, and AFAIK they have a very open API a lot of digital services in Sweden use for online identification of a private person. So I assume those pages probably use the tax-institutes API for personal information, and then other APIs (such as real-estate portals) to tie information together.