https://www.bloomberg.com/news/articles/2020-07-29/apple-con...
Depending on the product, you could be losing a significant portion of your customer base before then. For example Netflix, known for insanely good retention, loses nearly 40% of customers by month 12. [1]
[1] https://secondmeasure.com/datapoints/netflix-disney-plus-app...
"The agreement with Amazon is similar to a program Apple announced earlier this year letting select developers avoid the 30% fee in exchange for integrating with certain features. Amazon is part of that program."
Clearly for amazon, but not the same as any hypothetical negotiated private side deal with facebook.
Still, now that mobile hardware comes close to being commoditized i think there's hope, maybe from an unexpected place (like the open source community ? one can dream..)
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.