I'm not confident that Samsung is interested in developing the Android platform, though. They seem to be working on a proprietary ecosystem to separate themselves from the rest of the Android ecosystem. In fact, this is probably one of their motivations: to have control over a leading browser that isn't Chrome so that they can integrate it into their phones as default instead of Google's solution.
Actually if Samsung wants to be a player I really think they can't afford to be tied to Android long term. Too much control at Google and Google is another player and nominally an 'opponent' at some point. Of course their is "Android" and there is the stuff that Google puts around it. Watching the Chinese companies add value to the OS install has been instructive as well.
What Android has done has shown the component manufacturers some ways to expand their markets outside "known" players. Part of the challenge of making a phone is getting the chip vendors willing to sign off on giving you software to run their chips (weird I know).
My guess is that carriers want to be able to advertise to a captive audience, and in the US and EU, they can largely choose which phones their users buy; so killfiles as a feature are verboten.
Having spent a week at Samsung Headquarters a couple of years back I can assure you that they are extremely platform-neutral. With the scale at which they operate and the pace at which the industry moves, they would be crazy not to... missing a single 6-month window for global product delivery on a new OS platform against their major competitors (nearby Taiwanese HTC, arch-rival fellow-Korean LG, up and coming mainland Chinese companies, etc.) could be equivalent to many hundreds of millions of dollars of lost revenue.
At the time I visited, circa 2.5 years back, they had (usually physically disparate) skyscrapers within their HQ complex for at least three or four different mobile platforms (Bada, Android, Windows Mobile, and something else I can't recall). Right now I'd assume they have some resources on FirefoxOS and Ubuntu, plus Android, maybe some other systems.
