Delete a "Usecase" from a Project

Last year, there was still this “Usecase” App which served as a different front page to a project. I created one and applied it to one of my productive projects. Now, I would like to remove it again since it is not supported, but I can only see “Delete Usecase, this cannot be undone”. Which is not really motivating me to click the button.

Can anybody shed some light on what happens if I actually delete the usecase? Which resources are removed? Given the fact that the respective project serves as as the source for a DevOps package and Marketplace deployment I am even more hesitant…