I don't often/ever encourage people to watch videos, but this would be 30 minutes well spent, even if you don't like his humor:
Data Brokers: Last Week Tonight with John Oliver (HBO)The whole segment is pretty terrifying. Everyone knows (or should know) that most browsers, websites, and apps monitor you and collect your data. What many people don't know is that data brokers buy and sell every piece of data about you that they can, right down to your debts and your medical conditions, and they sell it to literally
anyone who wants it. A broker called Epsilon settled for $150 million after selling data to people they knew were scammers for over 10 years. Data has been sold to domestic abusers and stalkers, allowing them to track down old victims. The video mentions a case of a murder after the victim's data was purchased for less than $50.
Plenty of companies say your data is anonymized, de-identified, or collated with other data before being shared or sold, and lots of people think that means they are safe. Not so. One study found that 99.98% of anonymized data could be de-anonymized and used to identify individual users. Anonymizing data is meaningless. Even simply visiting a website (but not actually doing anything on said website) still provided the website with enough information to personally identify the user in question, track down their contact information, and send them an email minutes later.
They sell your data to the government. Governments might need a warrant or other legal ruling to come and search your computer or devices, but they don't need any permission at all to simply buy that information from data brokers. Multiple three letter agencies are buying your data and using it for anything they please. This is a very similar situation to a variety of three letter agencies employing the services of various blockchain analysis companies to track your bitcoin addresses and transactions.
In addition, centralized exchanges provide all sorts of data to data brokers, especially if you willingly hand over your KYC information. So do blockchain explorers. So do servers of SPV and light wallets. So will sites like Coinmarketcap or various crypto news sites. All this bitcoin related and other crypto related information will be pooled with all the other information held about you and sold to
anyone who wants it, including scammers and criminals. Remember that simply clicking on a website was enough for that website to identify that exact person. Do you really want the whole world to know how much bitcoin you are holding?
The amount of privacy invasion going on in our daily lives is staggering. Don't make it even worse by willingly violating your own privacy.
A good place to start taking back some control in general:
https://www.privacyguides.org/Peer to peer bitcoin trades, avoiding the privacy invasion of centralized exchanges:
https://bisq.network/,
https://localcryptos.com/,
https://hodlhodl.com/Run your own node, and avoiding leaking information about your addresses and transactions:
https://bitcoin.org/en/bitcoin-core/