NoTimeDaddy gave it Accessibility service permission … How dangerous is this?
Very. I believe when you grant an app this permission, the prompt asks you to grant “full control over your device” or something like that. Hopefully you didn't miss this text? Apps with this permission can see everything on the screen and make taps/actions on your behalf, including sensitive actions like granting more permissions to themselves or other apps, etc.
If you already have set up the Auditor app prior to granting the accessibility permission, you can revoke the permission and then use Auditor to check whether you were successful in revoking the permission. However, if you haven't already set up Auditor prior to this, don't set it up now, that's insecure.
Alternatively, you can boot into Safe Mode, disable the app there and reboot back to normal, and then either revoke the accessibility permission while the app is disabled, or uninstall the app if that's impossible. (As far as I remember, it's impossible to revoke accessibility permissions in Safe Mode.) To make sure you're actually booting into Safe Mode: hold the power button for about 35 seconds and release it (from now on don't touch the power button anymore), and wait several seconds for the device to power on by itself — this is a hardware mechanism that forces a power cycle, so software on the device can't fake it. Your device will only boot verified Google firmware and GrapheneOS. When you see the Google logo, start holding the volume down key and keep holding it until you reach the lockscreen with “Safe mode” written in the corner. To get out of Safe Mode, just reboot like normal.
This app does NOT need accessibility permission to do what it does! There's already the app usage data special permission, which should achieve the same, without the negative security implications. You can try emailing the developer of this app about this.