I’m very picky about what I allow through a firewall, and deviant art is heavily integrated with the Israeli company Wix. More than I care to enable. Like there is some kind of code or executable between thumbnails and full images that requires trusting a wix server implicitly. I draw the line when the DNS listing could be accessed by other websites and is not just a media server or CDN. Anyways, is there anywhere else with ultra niche type science fiction stuff beyond childishness, fantasy, and franchises and some hard science fiction stuff like O’Neill cylinders?
Have you checked Artstation?
I’m not sure about shareholders or anything like that, but I like ArtStation. There are tons of artists on there with all kinds of varying styles. There are 3D sculptors, 2D artists, and almost everything in between. You can find just about any kind of topic or theme covered, too. There are tons of actual current industry artists and renderers that use the platform as well, like people who work at Bethesda and id, among others.
Like I’ve seen some very cool art of Symbiote/Justice League crossovers, like a Flash/Carnage or a Venom/Batman. Hell there are even Neopets artists (that actually work/worked for Neopets) on there.
My mind went blank. Yeah ArtStation is the good one. I can’t believe I did not have that bookmarked.