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I keep noticing a wrong narrative when it comes to FOSS software. Comparing software to traditional labouring jobs is quite pointless: you designed and built a car for yourself, building a second one for someone else has costs; you cleaned your own private garden, cleaning someone else's garden has costs; repairing every bike, however sophisticated you are, has costs (Just listing the narratives I see on this page). Giving away a software you already have wrote for yourself has almost 0 cost, and I think this is the main motivation (at least at the beginning) of most FOSS software: the developer themselves needs to use it anyway. This uniqueness is what I consider one of the main reason why FOSS can succeed in the first place unlike in almost any other engineering fields. In a sense, you can say it is exactly what Marx call "all sources of collective wealth flowing abundantly".

This is very different from: I see an ongoing demand for X, and thus I work to provide a product that supplies X. In this case, naturally, I will not want to give it away for free, even if it is software.