Except Apple is also heavily going against Jailbreaking, with multiple lawsuits in the past, and system updates made specifically to patch them out, and nothing else.
Sure, you can stay on older iOS Versions, but you would be loosing actual improvements
The Problem isnt fast fashion itself, its the way Ultra Fast Fashion companies like Shein blatantly steal designs from smaller designers, have horrible work ethics, and do TONS of green washing
If you understand German, I'd watch Simplicissimus's video on this, it's quite well made in my opinion
https://github.com/apple/darwin-xnu