I'm not sure if I understand correctly.

For me, it is mostly about "sharing the code" as in: I put it somewhere and anyone who wants can use it. But if they adapt or remix it, they should also use a free license (ideally contribute back to my project).

> in the sense that it does not prevent tivoization?

I'm not sure, but I guess it does not protect against tivoization because if I were to distribute an executable or library, that could be used on a blackbox with proprietary code without them requiring to open their own code.