Stuff you upload does not belong to Graal

Its just not neccessarily worth it to go into all the trouble of having justice in the end

As creator of something, you automatically have your copyright on it, you can then give it around as you please

The ToS only state that you agree to not upload copyrighted material onto the servers...

If someone stole your head that you made from scratch and only want yourself being able to use it and have proof of creatorship with wips and core files or sketches with appropriate last modified date, then you could technically sue whichever party violated your right

Before you take the word "sue" or "court" in your mouth, youll need to send a DMCA Take down notice to the host with proper evidence, if the host doesnt reply, you can go further