Why? I'm 30+ and would love a good online image editor. All of the ones I've used over the years do something to make them inconvenient.

Granted my use case is doing minor modifications to graphics on occasion. But it's not like everyone that needs photo editing wants to have to install an app on their machine.

And there's nothing about photo editing that a web browser can't do fairly effectively these days. Video editing is definitely tricky but something like Windows Movie Maker I can see working well in a browser. But not anything for professionals.

The best online image editor is definitely photopea, https://www.photopea.com

Full psd Photoshop compatibility and everything.

And also not realize that Gimp and Blender exist.

recipe for disruptive startup ... identify existing and free 'native' application, select three features from application and implement as web-app/SaaS, host in cloud, sell subscription.

Yeah, let's sell something with even less features than the free alternative.

Sounds like a winning game plan.

If you have better UX and UI and concentrate on a small number of use cases but make them very easy, yes.