The definition of private property is defined by political systems, which are shaped by cultural norms and values. It's unlikely that humanity will still treat intellectual output as private property centuries from now. The digital (and network) revolution are paradigm shifts, and the latter can take a very long to play out.
That said, financially supporting worthwhile projects is a moral duty. So please do your part.
"Privacy means people know what they’re signing up for, in plain language, and repeatedly." - Steve "Newspeak" Jobs
Apple doesn't care about what cyberlibertarians think about their business practices. Baking in ads won't affect sales (might even prop it up if used to subsidize devices).
That said, financially supporting worthwhile projects is a moral duty. So please do your part.