lalkek The usage of the Play Integrity API is a decision for the App developer. Problem is, not all App developers understand (in some cases, don't care about) implications of their choice for GOS users.
One of the implications that not all developers know (or, even care about, if they do know) is that passing "strong" integrity isn't purely about security - it is also about supporting Google's competitive position.
You can try contacting the App developer to encourage using alternative means of checking device security. But not all app developers are interested in accepting the cost/effort of doing so.
I've personally lodged a formal statement to the Australian Government department responsible for the MyGov app with a similar concern. I'm hopeful there will be appropriate and considered followup, but not holding my breath. The process of lodging such a statement was moderately complicated, since the relevant means of contact listed in the Play Store for that App are non-functional.