As an individual who currently resides in Syria, I find this simply absurd, but the reason isn't simply Embargoes, it happens to be most embargoed countries do not implement copyright laws pertaining to US (and most non-US) company products. Some might have the spiteful reaction, 'well then they shouldn't be provided any services', while the reason for these companies not getting any copyright rights, is the fact they don't have official representation in these countries for the same reason the embargoes exist, politics.
This brings us to the main reason some services have been denied to the aforementioned countries, Revenue, now because nationals (and residents) of these countries do not abide by global copyright laws, almost all services provided to these countries are either the free in nature, or in the case of non-online products (e.g Windows XP) piracy is the norm.
So as some of you mentioned, its all about politics, what we here see, is a sign that the political status of these countries as embargoed countries, won't be changing any time soon. And the reason is simply, Revenue.