They've been actively fostering the enshitiffication of the App Store. Practises like preventing paid upgrades forces developers to use micro-transactions to survive. They also aggressively change and deprecate APIs without adequate notice or documentation. This means apps require constant maintenance. So one-time purchases are much less viable for developers.

Soon we'll be able to install whichever apps we like in the EU thanks to the DMA. I think there is a hunger for alternative app stores.