Most dark matter is expected to reside in a halo, much larger than the visible part of the galaxy: https://en.wikipedia.org/wiki/Dark_matter_halo https://en.wi

Most dark matter is expected to reside in a halo, much larger than the visible part of the galaxy: https://en.wikipedia.org/wiki/Dark_matter_halo https://en.wikipedia.org/wiki/Dark_matter_halo So it's more weakly bound than most of the stars. Technically, it's outside the tidal radius: https://academic.oup.com/mnras/article/366/2/429/1213793 https://academic.oup.com/mnras/article/366/2/429/1213793