Existing work on AI openness has focused on defining what technical components or release practices qualify a system as "open". However, less is known about how openness is understood and put into practice by people who adopt and adapt these models under real-world constraints. In this paper, we present an empirical study of r/LocalLLaMA, a large online community centered on running and customizing open foundation models locally. Through thematic analysis of community discussions, we find that members conceptualize openness pragmatically - in relation to reliability, local control, privacy, and the ability to adapt models under constraints such as compute resources, licensing, and usability. We identify key motivations for adopting open models, including autonomy, experimentation, and resistance to platform instability, as well as deterrents such as steep learning curves and performance gaps compared to closed systems. We further describe how shared resources and projects, including datasets, evaluation frameworks, and inference tools, sustain interdependent development in the broader open AI ecosystem beyond individual model releases. We then discuss the implications of a utility-oriented view of openness, and how producer support for downstream usability and infrastructure could better enable sustained innovation in open model ecosystems.

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