Why isn't it acceptable? Not everyone needs MS spyware on their devices. Having such option for those who really need it for some reason is OK, but "not acceptable for a phone" sounds a bit stretched, when Skype isn't exactly known to be user friendly. Sorry for going off-topic, but this was standing out.
IMO, the only thing unacceptable would be if it couldn't be uninstalled. I hate the current inwash of proprietary, closed, centralized protocols.