https://arstechnica.com/gadgets/2017/11/skype-is-the-latest-messaging-app-to-disappear-from-chinese-app-stores/

Yet another popular communications app has disappeared from app stores in China. According to a report from The New York Times, Microsoft's messaging service Skype is no longer available from app stores, including Apple's App Store. Google's Play Store doesn't operate in China, but Skype hasn't appeared on the various third-party Android app stores in the country since late October.

“We have been notified by the Ministry of Public Security that a number of voice over Internet protocol apps do not comply with local law,” an Apple spokeswoman told The New York Times. “These apps remain available in all other markets where they do business.”