What about copyright it self? If they have manage to abuse it even with google what are chances that they would not find a way to abuse it on smaller platforms?

In this situation here google is not willing to check if an automatism failed. I do not think that problem applies to selfhostetd content. But who knows, its a world where everything is possible....

They would. That's why you should avoid platforms, they go against the principles of the decentralized World Wide Web.