The open source ecosystem by virtue of being free software just doesn’t have those billions of dollars to invest. For office software google docs are sufficient for a whole lot of use cases and easily shareable whereas more complex usage is easily handled by libre office.
Photoshop is legitimately better than alternatives but popular as it is only a tiny fraction of PC users use or need Adobe.
26M vs 2B is approx 1.3% of PCs
I also don’t need to select my car based on its ability to haul thousands of pounds of cargo or its performance on a racetrack either.
If we want photoshop for Linux we need to collectively bankroll it. If not there is plenty of space in the market for computers without photoshop because that is by far the majority of computers.
Alternatively coming soon to a web browser near you