And no, GIMP is not competition (and I have been using that, since the late-90s).
The fact that I use it instead of Photoshop shows it is. I suspect that as Photoshop start moving more and more to the cloud and users have to pay a subscription, more people will suddenly find Gimp very competitive.
I would rather rent Photoshop than ever use GIMP again.
A complex system that works is invariably found to have evolved from a simple system that works.