@caycedo Yes, Google has a “kill switch” which can automatically remove any app downloaded from the Play Store: https://www.wired.com/2010/06/google-flips-remote-kill-switch-on-android-apps/
I suspect all of those apps were removed (or at least the ones downloaded from the App Store).
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.