Artist Jingna Zhang built Cara, a platform explicitly intended to protect artists from having their art stolen by AI...and yet these people just won't leave them well enough alone.
Now how we deal with mass scrapers downloading images; that’s a legal issue. One that even physical venues isn’t immune to (it just adds a lot of friction).
That's the point!
The friction is the key.
If you post images on the internet, how accessible they are directly correlates to how "downloadable" they are. Trying to imitate social media while fighting all scraping is a infinite, costly battle; that's a service trying to make posts viral and inaccessible. Such a fight takes Facebook money to sustain.
And it's not necessarily some script kiddie troll that's boasting about it on Reddit who will eventually get access.
...But add fundamental friction? That raises the bar.
I think the fallacy is artists believe they need an gigantic amalgamation of online people exposed to their art, a large fraciton of the internet. That's not true. And its a deception, anyway. Smaller niches or smaller communities are fine, and they won't be such high profile targets.