Let's work with your assumptions, hopefully you can realize why they don't really make sense when it comes to consumer rights or healthy competition.
So companies "will do everything they can to screw over the customer". Apparently excluding Apple for some reason who can never do wrong or suddenly start demanding apps charge subscriptions instead of a flat fee in the first place, but let's continue.
Companies that have their own infrastructure to support their own payment systems will switch to it, but have to create a justification for consumers to switch as Apple isn't going to do that work for them. So maybe they cut the fee, maybe they throw in a bonus whatever. Some consumers switch, finding this new method acceptable.
Then there will be other consumers, like you, who value Apple's system too highly to switch. If the above hypothetical company does not support both Apple and their own systems, this group of consumers will opt not to continue subscribing.
Now tell me, how is this so bad? How are you unable to avoid scummy business practices?
So companies "will do everything they can to screw over the customer". Apparently excluding Apple for some reason who can never do wrong or suddenly start demanding apps charge subscriptions instead of a flat fee in the first place, but let's continue.
Companies that have their own infrastructure to support their own payment systems will switch to it, but have to create a justification for consumers to switch as Apple isn't going to do that work for them. So maybe they cut the fee, maybe they throw in a bonus whatever. Some consumers switch, finding this new method acceptable.
Then there will be other consumers, like you, who value Apple's system too highly to switch. If the above hypothetical company does not support both Apple and their own systems, this group of consumers will opt not to continue subscribing.
Now tell me, how is this so bad? How are you unable to avoid scummy business practices?