I guess the variety of concerns will vary from country to country depending on local laws / existing open data though.
The owner doesn't really have a reason to care, I don't think, and may even be incentivized in some situations to reveal information the tenants would rather they not.
Goodness. I should give the First Amendment a hug.
In most places renters are only granted 24 hours notice to have complete strangers come walk through their living spaces while the space is shown off. They have no real right to refuse to allow that.
If people start knocking on their door asking to come look at the place they are free to refuse, or ignore the doorbell or anything else. Of course they have a freedom against being harassed, so if people persist they can get police involved. That seems like a separate issue to me from having their address posted online in a rental listing.
In some EU countries they do. The landlord need to ask permission to have visitors at your place and the tenant has the right to refuse.
Are you sure the tenant isn't just allowed to refuse "a time slot" but also must offer alternatives?
Story time: A couple of years ago, I was looking to buy an apartment and saw one spacious apartment centrally located that was way below market price but had no pictures in the ad. I called the agent and asked when can I visit as soon as possible since there's no pictures. Agent said the old lady currently renting it does not allow visitors inside, that's why there's no pictures. I asked how in the world can you buy an apartment without seeing it? Agent said that's why the owner is selling it below market price. And the charry on top, if you do buy it, you'll be forced by law to keep the current tenant who's paying frozen rent, not adjusted for the past 20 years, until she either decides to levees voluntarily or dies. That's why the owner had to sell below market.
someone being this hostile about it is rare but it sometimes happening is a necessary consequence of these rights.
anyway though in most places our protections are not this extreme. you can refuse a specific visit but have to provide a time when they can come later.