Despite this not being FOSS like GIMP, I think it's great that there is at least some very viable alternative that can run on Linux even with some workaround, for free (besides Photopea).
I use Darktable and GIMP for my photography workflow. Its good but not great. Affinity is worth trying for me and probably many others. I've been on the cusp of loading a modified version of windows onto a machine. Hopefully this works