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And, importantly, If your account is paid it never even loads the libraries or initializes the ad systems so there is zero data going to these trackers.
I don’t use this app (I use Eternity), but there’s nothing shady going on here. Developing an app isn’t free and it isn’t unfair for the developer to want to earn a living.
Power off.
Many phones can be accessed by digital forensic software (like cellebrite) only after they have been unlocked for the first time.
Depending on the phone, a restart may not reset the hardware security module, a power off will.