Depends on the circumstances, why someone would do it isn’t important, the fact it happens is.
As for circumstances, it doesn’t happen every time, you have to fully close the app, so clear it from the multitasking screen, wait a bit (idk how long, it’s less than the time this message took to write) then launch it again, sometimes you can actually do it instantly.
As for the time period it happens for, the person just has to know its a thing and can screen cap or screenshot or film the app opening then that image is permanently accessible for them.
The concern is that this can technically give out personal details and the issue has been around for over a year at this point.
I can now personally confirm its still an issue on Android using the latest app version, I’m using a fold 2 to test right now, originally the issue was discovered on a OnePlus 7T Pro