If my Shonen Jump subscription goes from $2 to $1.70, I'd rather pay the 30 cents than have to click and type for 2 minutes, and then have to solve a mystery to cancel it later.
If my ChatGPT Pro (hypothetical, I don't pay for that) went from $200 to $170, maybe worth it.
Your first comment where you said "Why not?" to a comment questioning the clause that apps are required to use in-app purchases would be read as supporting Apple's restrictions, i.e. no user choice.
If my Shonen Jump subscription goes from $2 to $1.70, I'd rather pay the 30 cents than have to click and type for 2 minutes, and then have to solve a mystery to cancel it later.
If my ChatGPT Pro (hypothetical, I don't pay for that) went from $200 to $170, maybe worth it.