Disagreed. It's not concerned with all apps, because most commercial applications have legal entities explaining how they use collected data. In this particular case, this is something called 'Refine', and it's not a legal entity, therefore, questioning its data privacy approach is fully legitimate.
Perhaps this type of software could be either open-source with full code accessibility, or proprietary but from a highly trustworthy entity responsible for privacy both legally and reputationally. Currently, both approaches are missing.