Krita has been a very decent Photoshop replacement for my small needs.
Even trying GIMP over multiple years I could never make sense of it's UI but Krita is a breeze and incredibly powerful.
Krita is literally a KDE app
It's free, has the same UI as photoshop so no re-learning hotkeys, and is browser-based.
Another aspect is privacy. Medium- and high-caliber professionals are reluctant to share the innards of their work with anyone.