The fact is, the majority of people do not want to steal others work for profit, and for those bottom feeders that do, there are lass to discourage such behavior and to protect the original producer.
If these models were trained on creative commons licensed material only, then you'd have a leg to stand on.
I even had to pay for my tuition, and textbook material. Even if some portion of my knowledge comes from osmosis, I have still contributed at some stage to access training material.
When I was 16, I wanted to learn to code, do you know what I did? I went and purchased coding books because even at 16, I understood that it was the right thing to do. To pay the author for the privilege of accessing their work.
How basic can one get?
Would you like it if I broke into your house and used your things without asking you? Because that's about what's happening her for professionals.