If I had a euro every time someone is skeptical of dark matter because they think it only predicts galaxy rotation curves, I’d have enough money for several be

If I had a euro every time someone is skeptical of dark matter because they think it only predicts galaxy rotation curves, I’d have enough money for several beers (beer is expensive in Finland!) GRC observations were the original motivator for the DM hypothesis, but in the following decades its predictions (specifically, those of a specific cold dark matter model well-constrained by evidence) have been in entire agreement with many observations in several distinct subfields of astronomy, whereas no competing hypothesis has been able to achieve the same. Indeed DM, or something very much like it, is a required ingredient in cosmology to get a universe even remotely similar to ours! As far as we know, we wouldn’t even have galaxies, much less the intricate foam-like structure of voids and filaments, without DM, and no competing hypothesis can predict the observed large-scale structure of the universe while also explaining galaxy rotation curves and everything else, for instance the Bullet Cluster, or the specific observed anisotropies in the cosmic microwave background.