You are a good human. Seems they had not tweaked the database rules correctly, maybe even left the default setup! That means you could have executed this: Fire

You are a good human. Seems they had not tweaked the database rules correctly, maybe even left the default setup! That means you could have executed this: Firebase.database().ref('/').set('All your data is gone'). Better yet, download the whole DB and then: Firebase.database().ref('/').set('I have all your data, pay me to get it back').