Idk this kind of feels like victim blaming. Why should you expect your photos to be used in a way that is so devoid of the original purpose you shared them for? It's like telling people to not go out of the house with money on them, you don't expect to be robbed, so why should you have your entire way of living affected by it instead of punishing robbers when that does happen, or in this case companies that abuse good will.
It's a violation of trust for sure, but users made the decision to post something publicly accessible and actually requested distribution. The lower tech version is putting your phone number on a flier and receiving a prank call. Ultimately it's a consequence of releasing that data to the public, and giving rights to said platform by allowing them to distribute it.
But I don't think companies are transparent enough with how they use things and usually ask for very broad licensing and usage rights for what you upload. Sure us tech literate people should and usually are scrutinizing that stuff, but what about the family aunt who just wants to share photos of their nephew with their close ones? On Facebook for example it even tells you you are only sharing posts with "Friends" or "Everyone" (or custom I guess) which might make those people think "oh just my friends see this, not the platform that I'm using"
I would also apply it on reverse, if you're a company or artist who created content and put it online, why would you not expect that somebody will download it without paying you? If they can, it should be totally fine.
Let's compare an apple to a car to a software...an apple is physical, if you take it without pay, the company has one less apple. Same with a car. With software that's not the case. You can't touch it and there is an infinite number of copies to be had.
The Internet is similar to a street except for the fact that thief's can walk on it without having anyone know or care about what they are doing. So if you leave a software or artware on the street, there's a good chance that it will get stolen. Same with the interwebs.
Just don't give companies that don't respect your privacy access to your private life. Keep your online life completely separate from your real life. It's not that difficult.