I am not sure if this is a bug. After setting up the app on a Galaxy S20 (Paid Filter) and giving a passcode, I can manipulate the whole setup again.
This is easily done by pressing “forgot passcode” in the window where I am asked to enter the passcode, entering 1234 and this is then my new passcode. With this I can then turn everything off again.
Have I misunderstood something, because that bothers me massively that a simple passcode reset is possible and I pay money for it.