Could your developers be a lot more specific in the "What's New" documentation in Google Play? This should include detailed information of current changes* or at least a link to the version release notes** or both*** — especially for this kind of app targeting ethical and/or privacy conscious individuals.

* e.g. https://play.google.com/store/apps/details?id=com.x8bit.bitwarden
** e.g. https://play.google.com/store/apps/details?id=org.dmfs.tasks
*** e.g. https://play.google.com/store/apps/details?id=at.bitfire.davdroid