A recent survey run by Blind shed some light on what various tech employees think of Apple and the App Store. Apple's own employees largely believe the company doesn't hold a monopoly on iOS app distribution, but other companies (namely Qualcomm and Spotify) believe that Apple's App Store constitutes a monopoly. The survey comes as a response to a recent Supreme Court ruling upholding the validity of a lawsuit filed against Apple for monopolistic practices.
https://www.notebookcheck.net/Is-Apple-s-App-Store-a-monopoly-Depends-on-who-you-ask.421375.0.html