In Germany you can call the city someone's registered at and ask for a person's home address and they will just give it to you, UNLESS you specifically tell them not to. If you haven't filled out the form for that, which most people haven't (because who even thinks about stuff like this?), anyone can find out. At least having to actually call and talk to a person as opposed to looking it up in a database on your own is one more step people might not want to take.

This isn't common knowledge. I only know because my sibling requested their info to be blocked because of some harrassment a few years ago

Edit: This might not be the case everywhere in the country. It might vary from state to state or even from county to county, idk. I only know about that one specific city my sibling lived in at the time. The point is that you can't make a blanket statement like that for all of Europe, and while it's true that personal information is usually better protected in Europe than it is in the US, you should still be careful with what you put online. In this example a google or database search may not get you anywhere, and at least you can protect yourself by opting out of having your personal info handed out to anyone who asks for it, but still. You gotta know how to protect yourself, and if you don't, it's better to err on the side of caution.

Being protective of your personal information is common in Germany btw. I think it's because back when the gdr was a thing it used to spy on its citizens and stuff, so privacy is a value that has been passed down over the generations.

I'm not the boss of any of you though. You can go ahead and post whatever the heck you want. Just don't be surprised when your identity gets stolen or something