It gives me an unpleasant feeling to see my art on someone else's page. Which is not the problem, but what is problematic is this: I uploaded my pictures on pixabay.com so that people if the want can link back to my profile or picture and can tip me some money if they fee like it. Max pixel wants all the credits for something they have not worked for. Avoid them. Go to pixabay, pexels, unsplash, etc.