>> Free software developers don't have any obligations to anyone else.

This is doing a lot of heavy lifting, and not really valid as a categorical statement. It's important to narrow the context because "Free software developers" are ultimately still people or organizations that fall into our established systems. There is no specific purchase contract between the provider and user, so unlike commercial software that supply-side obligation is not explicit. There's typically a license that tries to legal-away any responsibility, and this is not so clear-cut. Free software is not found at the side of the road without any providence. It's usually the product of one or more legal entities, promoted, it's use encouraged and maintenance & delivery can be implied by the actions of the developers. All of these things carry varying degrees of obligation within legal, cultural and social frameworks. We try to reduce this down to "no obligations" or "expectation to support for free in perpetuity" but no binary position is accurate.