Instagram being blamed for iPhone 15 overheating issues

darkvader said:
So, the same version of the same app isn't a problem on earlier iPhones or iOS versions.
But it's somehow that app's fault?
Nope.  This is on Apple.

You have ZERO basis upon which to make that claim. 

It's absolutely possible that Insta was accessing system libraries or APIs in a way that didn't conform with proper or documented usage specifications, but worked just fine until Apple changed something. This might not even be on purpose; might just be a bug that didn't show any consequences before (though Insta has always eaten battery like crazy on my phones). 

We saw that many years ago when Apple switched their laptops' Firewire hardware to a newer version of the Agere chipset, and a bunch of audio interfaces broke. People immediately pointed at Apple and screamed bloody murder. 
…except that a bunch of interfaces, whose programmers had properly followed spec in their drivers, worked just fine. The others got driver updates eventually and started working with the new 'Books. 

TL;DR: we don't know whom to blame, at this point.