One thing Twitter might have tried would have been to allow users to pay $8 to unlock high quality API access for any apps they want to use. Serious and professional Twitter users likely want to use more advanced tooling than Twitter offers to manage their own accounts. Let them pay for premium service.

Integration developers could then develop advanced features at no cost to themselves (other than developer time), and their users could pay Twitter to enable them.

Of course, Twitter has already mostly burned that bridge by devaluing the API.