The companies providing third party clients had already renegotiated their relationship with Twitter over the past few years, achieving a more stable baseline, API changes, defined escalation routes, etc. Musk's buying of the company and capricious shutting down of third parties without even having the option of having them do things like incorporate adverts is hardly something it was possible to plan for over the long term.

And that's exactly my point! Twitterific should have known that Twitter could pull the rug out from under them at any time, and had a plan to make their customers whole in that eventuality.

Look, I'm not saying a company in their position should have to refund a one-time purchase cost of the app itself (for companies that do that sort of thing). But if you are charging an ongoing subscription for continuing service, and then that service terminates before the end of the subscription period, I think a pro-rated refund is more than fair.

Hell, if Twitter themselves charged a subscription fee for having a Twitter account, I would expect them to give pro-rated refunds to customers if they decided to wind down their business or pivot to something else. Twitterific should be no different here.

This has been stated again and again but you’re choosing to ignore it in your attempt to make the app developers the bad guys in this situation.