This has nothing to do with the percentage cut they get, necessarily. It's about requiring developers to use Apple Pay only and not mentioning, encouraging or allowing users to pay for things from outside the app.
It ultimately reduces Apple's profits since they don't get a percentage cut from the outside payments, but they can continue to charge 30% from those that use Apple Pay. Same will go for Google since they have been trying to force developers to use Google Billing but have been pushing the mandatory date back. September was going to be the requirement date but it's pushed back to 2022, but that's probably not going to happen now.
Since Sony already allows payment from 3rd parties like Paypal, credit cards, etc., it doesn't affect them. Not sure about Microsoft but doubt they force their own payment system.
It's really good news for consumers, especially for apps that have reoccurring payments like subscriptions.