Positive Tinfoil hat on: The police would have used / were starting to use presence of the app as evidence that users were participant in the protest and arrest

Positive Tinfoil hat on: The police would have used / were starting to use presence of the app as evidence that users were participant in the protest and arrested them. Or the police would have been able compromise the users, the app or the data (but then why not keep it as a honeypot?)