Almost all of them include between 3-12 months of free service (I think specific lines in Chrysler's lineup across brands are the only ones with 12, Alfa Romeo I know of specifically).

A lot of vehicles it's actually considered an "upgrade" to the stereo system and is only included with the more premium package.

A lot of people buying cars usually ask about it having Sirius or Satellite radio; they've been adding a lot of new shows and stations like comedians and they have a lot of sports. Their comedy channels are very similar to comedy podcasts and they've been growing this lineup. Having it all integrated into your vehicle without having to plug in your phone is still a big feature with older people and even some younger ones.

The SiriusXM sattelites are in an inclined eliptical orbit with the highes point being over the norther hemisphere. This is the so called Molniya orbit, named after the first Soviet sattelites using it:

https://en.m.wikipedia.org/wiki/Molniya_orbit

(Soviet Union had a lot of territory in higher latitudes where geostationary sattelites do not work well & the Molniya orbit needs less energy to achieve.)

So in the SiriusXM case, the sattelite would be much too low to provide useful coverage when over the southern hemisphere. And even when. As for not covering EU/Asia - this could be due to either the highest point of the orbit being always over US (guessing there) or due to ground station coverage when the sattelite is not over US.