Well the argument some of these companies are making is that it would be cheaper over 10 years (some things like power can be cheaper in space, and you can get it from solar nearly 24h a day). It seems likely to me (as it does many other people) that it won't be cheaper, but if it's the same price or mildly more expensive there might be a regulatory incentive to train a ML model in space instead of a place like the EU