It's a mature market. Maybe the age of new and interesting apps is over? I know I've pretty much settled into a small set of apps that I use on my iPhone, ThinkPad, and iPad and probably haven't installed anything new (ie not upgrades) for five or ten years now.

The last new app I installed was either Fusion360 or Visual Studio Code.

I guess I have had to install apps for other things I bought (like Christmas tree lights), but I don't really count that because the app is only a gateway to the thing I really want to use.