ZoomInfo (public company) for example provides a free plugin for sales people which is scanning email for all the email signatures and then they sell all that data to their customers. Even crazier is they take data from their customer’s CRM systems.
DiscoverOrg is buying data from third parties without really knowing how they got the data.
There are a bunch of apps and browser plugins that read your emails or contacts and then those companies sell that data to third parties like these data brokers. I use very few browser plugins because of this threat.
If you have somehow acquired a list of contacts you can get a lot of these companies to purchase it with very few questions.
I ended up selling him the one web site that didn't have a mailing list and only rudimentary social media presences. I bought a new car and moved to a better city with the money.
https://ec.europa.eu/info/law/law-topic/data-protection/refo...
I don't think it applies to EU citizens overseas IMO. At least I haven't signed up for anything that asked if I was an EU citizen or not.
Would get really messy because there are lots of EU citizens out there that don't know it through jus sanguinis.
Meanwhile a lot of financial institutions do ask if you're a US citizen because it ups their reporting requirements.