There is 1000+ content in Disney+ and titles are removed from the application. There can be many reasons to remove movies and shows from Disney+. There are few pre-existing contracts signed in through other services like Fubo, Starz, Netflix, and much more. Disney+ even has many deals for the long term and those have to run for multiple years. In this situation, Disney can buy for themselves, or they can even wait for those contracts to expire. Maximum titles that are removed they are added back into Disney when contracts expire.
In recent news, Disney titles are licensed with Netflix, and with legacy contracts. They also have the estimated date of removal which is very decent. Whenever subscribers search Disney+ on Netflix, it gives results in 30 seconds. You can get more than thirty titles on that particular application. Though ten titles are already listed, and those are Disney+ already owned, so those are always available on Disney+.
The problem is like Hulu, Netflix, Peacock, and Disney do not disclose anything before they remove the title from the service. If they inform the audience can share their views about the film. Once they release, they never add them back. Compared to other application, it does not draw such content.