[chgs]

If I take your physical thing away you are left without that thing.

If I copy your thing you still have your thing.

While property ownership and restrictions on being able to say or write something are both constructs governments apply, they are very different principals

[mnau]

Ultimately they rely on same principle: this is mine. I made this, it's product of my work. It's mine to do as I please.

Government made laws to put this into practice.

Edit: Ultimately, to say you don't protect IP in some reasonable form is to say only work that produces physical stuff has value and is worth protecting. That all thinking is not a work worth protecting.

It's not like there weren't systems trying to make a different concept of material ownership. Communal ownership mean the thing is never yours in the first place. You never owned and thus it was never taken away. It mostly didn't work.