I get all my pictures from Pixabay except for animated GIFs and photos from celebrities for my memory series. And in that regard I am adamant. There are thousands of YouTube videos out there which make millions, based on Marvel copyright protected material. They are also being shared by thousands of fan websites around the world, which moneytize them through ads and other means. The same goes for the gaming industry. These kind of things are usually tolerated and wanted. They are merely for entertainment. I do it for education (and entertainment).