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It depends on what you mean by 'etc'. The problem might not be in a single leak, but with enough leaks people can get access to all kinds of PII (personally identifiable information). It's important to me that my physical address not leak, I don't want people or packages showing up that I didn't ask to show up. If your important numbers (in the US that's passport, social security, and driver license) get leaked, it becomes easier and easier for someone to commit identity theft and open credit cards in your name which you will have will have to pay with either money or a lot of time proving it wasn't really you. Or they can get traffic tickets in your name which will become a warrant for you. And if they know enough about you (address, likes and dislikes, etc), it becomes much easier to socially hack (https://en.wikipedia.org/wiki/Social_hacking) you. Any security is only as strong as its weakest link, and social hacking has been used to get access to people's bank account, email address (doesn't sound scary but if someone has access to your email, they likely have access to all of your accounts because they can trigger a password reset, intercept it, set a new password, then lock you out), and a lot of other things. |
The financial sector abuses some of the more obscure facts about people (SSN, DL/passport number, bank account number, address history, mother's maiden name) as authenticators. They aren't. In the short term, someone can create a lot of bureaucratic hassle for you by knowing these facts. In the long term, institutions will adapt to the reality that knowing them no longer proves anything.
The stuff you should really care about, IMO: Contents of private conversations. Interests and opinions expressed online that could harm real-world relationships. Habits and characteristics that could signal insurance, credit, or crime risk. Political activity far from mainstream. Relationships with controversial or high-risk people. Evidence of excessive wealth for your context.
The fact that person with your metadata exists and does normal life things like having a home, a job, a cell phone, and a bank account is always going to be well-known. This information is more or less neutral. The real secrets are those which might prompt some actor (friend, lover, ex-spouse, family member, boss, insurance underwriter, lender, police, secret police, conman, vigilante, person who is wrong on the internet, etc) to turn against you, or to do worse damage than they would otherwise.