Why not? They also built on Android to have one common ecosystem with all the benefits of scale. If Huawei now builds their own App Store, Samsung risks losing customers in countries where Huawei already dominates. Building one together would at least keep the status quo.
Please use some sense. You are suggesting Samsung and Huawei - two of the fiercest competitors to collaborate on an OS? While the Occam's razor argument is that Samsung will just goto Android with Google's apps and bleed Huawei away.
Because of their country of origin. They both are based in democracies and are unlikely to be embargoed like Chinese companies. What we see are symptoms of trade war between China and the west. South Korean and Japanese companies do not share the same role in this story as Huawei.
While I agree that South Korea and Japan are unlikely to face embargos, the trade war is not between China and the West. It's between China and US only. I don't think any Asian country is happy about this as no one wants to have to choose sides.
