Not really. The Twitter API allows both read-only and read/write access. iOS, as a system-wide grant, has read/write permissions - but apparently does not allow users to specify per-app permissions to be that granular.
Moreover, the app was apparently locking out paid users from any access at all unless permissions were granted, which in itself shouldn't have made it through Apple's vetting process in the first place (exception: twitter clients). The majority of apps will only need access to the "share sheet" for posting to twitter, which AFAIK doesn't require explicit permissions (similar to sending an email; the user must hit send)
Moreover, the app was apparently locking out paid users from any access at all unless permissions were granted, which in itself shouldn't have made it through Apple's vetting process in the first place (exception: twitter clients). The majority of apps will only need access to the "share sheet" for posting to twitter, which AFAIK doesn't require explicit permissions (similar to sending an email; the user must hit send)