It wouldn't surprise me if all (FB, Apple, Twitter, now RIM) but one (Android) digital platform curation teams acted in the same way. Of course, it is their platform, their right.
Android can afford not to because Google have a different business model.
Verizon being the sole carrier with Skype will hurt Skype's adoption on mobile phones because if you want to talk to someone with an Android phone, they have to be a Verizon customer. Thus, it isn't a given that they will have the ability to Skype, so you use the mobile phone network, inferior as it is, instead.
The oddity of Skype is entirely Skype's making -- they saw a revenue model negotiating with carriers (the idea being "Get a Verizon Android phone because then you can get Skype"), so that's what they did. They control their own product, so there it is.