Where did you get that out of the article? There was no comparison to other galaxies. It appears as though the exercise was performed for the Milky Way because of the detailed information available on its potential (and based on the assumption that this maps to dark matter). Presumably similar results would apply to other galaxies, since the shape of dark matter halos seem—from cosmological simulations—to be fairly universal. But I never got out of the article that the authors suggested the Milky Way was somehow "special", compared to other galaixes. In fact, if you look at the abstract from the preprint[0] it concludes with "thereby confirming the possible existence of wormholes in most of the spiral galaxies." So they explicitly state that this result would apply to a large number of galaxies.
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> Its also incredibly arrogant and anthrocentric to think that our galaxy is one of the "good ones" for space travel.