Most these companies are very clearly focusing on a US market first, so their pool of likely coin buyers is Americans. I'm guessing that many of them also want

Most these companies are very clearly focusing on a US market first, so their pool of likely coin buyers is Americans. I'm guessing that many of them also want to keep the option of getting additional rounds of funding by selling equity rather than scrip. If leaving US jurisdiction reduces the capital markets that are most important to them, then I doubt they will decide that it's worthwhile to do so just for the sake of being able do ICOs.