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.
Cool insight - thanks! All points even more to bad planning by the Instagram team as you said originally.
I guess I wouldn't be particularly surprised. Apple put shitloads of R&D into power-efficiency. Can't imagine the culture at Instagram/Meta is like that.