I remember writing apps for the iPhone and the biggest hurdle to getting it submitted was sizing the screens for the display variants.
There would have been no chance of developing an app for the Nokia ecosystem with all the different screen sizes your app would have to support.
Even downloading an app or ringtone required going through all these scammy websites and you had to enter your exact Exact model number and pay somehow…then they would text you a link or something.
Apple really cleaned up the ecosystem with the App Store. It made apps safe to download.