Apple has acknowledged user complaints that iPhone 15 and 15 Pro phones are overheating, reports Forbes, but said that contrary to speculation, it has nothing to do with the phone’s hardware design. Forbes noted an update to Instagram has already rolled out with version 302, released September 27th, to address some of the issues.
This is almost certainly an iOS 17 issue, and it looks like it’s going to be patched soon.
Blaming the titanium doesn’t make sense. People are also reporting the issue on the iPhone 15 models that are all aluminum and are running an iteration of the old A16.
This will be a non issue in a few days.
Edit: People are also reporting that these apps heat up the logic board of older hardware, iPads, etc. This looks like a good old fashioned case of a bugs in a new n.0 OS and apps that have not been updated to run smoothly in a new OS.
https://youtu.be/P6X2ZIkYFsQ?si=-bZpEf5-lh_vEBdM