That's not a good analogy either. Apartment is a physical, limited resource, using it denies it to its owner and deteriorates its condition. Digital copy shares none of the properties with a physical resource.
Revenue from a purchase that I'm not going to make is non-existent. It can't be lost or gained.
>You deprived someone of the revenue generated by their property
You have not; that revenue never existed.
Squatting is sometimes legal (in the UK at least) and squatters can end up owning the property if they live there long enough.
You deprived someone of the revenue generated by their property. Still theft.
If you squat in an apartment, is that theft?