I think it goes against the spirit of FOSS, as docker is all but a proprietary Linux format, and definitely not POSIX(-ish) compliant. As I prefer using OpenBS

I think it goes against the spirit of FOSS, as docker is all but a proprietary Linux format, and definitely not POSIX(-ish) compliant. As I prefer using OpenBSD for self-hosting (and I speculate that if more self-hosters learned OpenBSD, they likely would also prefer it), I am acutely aware of not only how Docker has gradually taken over nearly all new FOSS projects, but also how many people involved in FOSS projects generally assume GNU / Linux as a prerequisite to all FOSS projects.