Sure, and if those happen then the developer will eat the cost. They've only asked people politely not to, given the extraordinary circumstances, not said that people cannot.

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.