Startup Graveyard

Sometimes I have apps that are new and cool but that I use occasionallY. When I have to use them, some won’t open because the App Store will say that the creator of the app has not updated the app. Sometimes months go by and still no updates. Are they out for good? Are the app creators aware that they need to update app? Are they working on it? I’d like to know! So, a graveyard would be a good point of referenc.