Are you referring to smartphone/native apps?
The IOS golden garden is a problem here, BUT the recent EU regulations about apps sideloading (https://www.macrumors.com/2023/04/17/app-sideloading-support-coming-ios-17/) could change the situation.
A partnership wit F-Droid could be huge to promote nostr ad this sort of ecosystem.
Happy to start a brainstorming project if someone want to join the taskforce!