Can’t have one’s cake and eat it.
Sure we can. You don't need to either use Instagram or never use the net. That's precisely what Cara is for. Promote open source tooling and use friendly communities that don't promise to scrape your life's work.
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).
You either post online, where people can and will do stuff you don’t like with your content, or you keep it private.
I think there's a difference between "this person took a few images and edited them" and "I scraped an entire website to use for training AI slop".