Grindr have done something with the way the app interacts with Google play services for some kind of security measures where if you uninstall the app and reinstall your account will appear banned. This is not always the case, It is banning androids device i.d, so if you factory reset the device you get a new device i.d and miraculously Grindr works again. If you logout and then use a different Gmail account and sign in auto with Google the app wil say something is wrong and won't let you login.