Snapchat, the image and video sharing app, has experienced continued issues with their internal API being used in unauthorized means by 3rd party apps. In response, The Verge has confirmed that Microsoft, upon request by Snapchat, has removed all unofficial Snapchat imitation apps from the Windows store.
Many of these imitation apps claimed to be the official Snapchat Windows app. Not only was their presence in direct violation of the terms of service (a point that has been disregarded in the past), but according to Snapchat, these unofficial apps compromised the security and reliability of their service.
Though in a November Blog POST Snapchat related that they "enjoyed some of the ways developers have tried to make Snapchat better," they announced their plan to notify users when they may be using third-party apps with a request to change their login password and to erase the rogue app.
Other large services, such as YouTube, Vine, Instagram, and Pocket also do not support the Windows phone, which similarly has sparked a trend of 3rd party alternatives.
Rudy Huyn, developer of 6snap, an unofficial Snapchat app for the Windows phone, confirmed with a Twitter post that his app was completely removed without the option to republish.