Have you considered any of the following to protect privacy & mitigate eavesdropping:

+ password or SSO protection for access to the app's data (use Kerberos/AD SSO for credentials?)

+ an end-user controlled encrypted store for the data & screenshots (FUSE/WinFSP?)

+ a daily local push/popup notification displayed to the logged-in user with... a) app status b) data summary c) a quick action to toggle the background recording service on/off

Just my $.02. Cheers!