According to the search results, the Chai AI app is no longer available on Android and iOS app stores. Users who already have the app installed on their devices can still use it as usual, but those who try to download the app on a new device or update it on their existing one encounter an error message stating that the URL was not found. The developers of the app sent out an official email to users, stating that the removal is temporary and that the app will be back in the Android and iOS app stores within a week or two. The reasons for the apps removal are not entirely clear, but some sources suggest that it may be due to the apps inappropriate content, including chatbots that could be prompted to defend underage relationships and provide sinister content.