Chinese users of the instant messenger Signal knew that the good times wouldn’t last long. The app, which is used for encrypted conversations, is unavailable in mainland China as of the morning of March 16, a test by TechCrunch shows. The website of the app has been banned in mainland China since March 15, according to censorship tracking website Greatfire.org.

Signal could not be immediately reached for comment.

The encrypted chat app was one of the few Western social networks that remained accessible in China without the use of a virtual private network. The likes of Facebook, Twitter and Instagram have long been blocked. In some way, a ban is a badge of honor, signifying a foreign app has reached a substantial user base in China that catches the attention of local authorities.

Signal is still available for download on Apple’s China App Store as of March 16, an indication that Apple hasn’t received a government order to remove the app, which is gradually gaining ground among China’s tech-savvy, privacy-conscious users. The app has 4.9 out of 5 from 37,000 ratings on the Chinese App Store.