Exclusives cost money, and Nokia is the only OEM that has a real need for exclusives in our platform.
???
Both HTC & Samsung spend huge amounts on OEM content for Android. Yet provide the very minimum for WP (both 7 & 8).
In 2 years of HTC WP7 ownership, i don't recall there being more than about 10 HTC apps. Nokia have added that many in the 2 months since WP8 launched, and we all know are actively working on more.
I have no doubt HTC & Samsung do the very minimum to fulfill their contracts with Microsoft.
If anything, every single WP owner should be pleased that Nokia are doing exclusives, because you can bet most of them would never have come to WP had they not been thrown money by Nokia, and all the 3rd party stuff is a timed exclusive, so everyone gets it eventually.