Because users like Apple's policies. Most us of don't want a recreation of the web where companies try to "optimize" the subscription cancellation experience.

Because users like Apple's policies. Most us of don't want a recreation of the web where companies try to "optimize" the subscription cancellation experience. Or to have multiple app stores each with exclusive apps being sold at a premium and having to manage payments separately. Apple's rules do have a lot of real benefits for users and so you have to weigh that up against the interests of developers.