I'm from eastern Europe. In the soviet era noone could own private property, everything was belonging to the state. Then, the state rationed food to you, allowed you to use one of their homes in exchange for labour, allowed selling produce on government-controlled prices, and buying in predetermined quantities.
So let me ask a question. When you buy a home with all your life savings, does it become yours? What makes it differ from the soviets? I mean, obviously they recorded your rights to the building on paper, and now they record it in digital databases. But is it REALLY that different? You don't truly own either. It's all the government's promise to let you access it and keep away whomever should not access it, until they don't.
The only thing you truly own is bitcoin. The rest are promises.
You already answered the question you asked if you go through your first paragraph. In communism, everything belong to the state and if your country is not practicing communism now but capitalism, then if you buy a home it is yours and truly yours if you got all the necessary approvals and papers. My country practices fake capitalism, fake because they can still cook up something to steal your natural resources and land, yet we still have right to sue the government when they try to encroach and they will plead for out of court settlement. So it depends on the country you come from and how well the people in power respect their laws and institutions.