I don't understand, if you have a 3d model, why do these gifs need to be so low res and aliased? The AI isn't generated gifs, why can't they properly render the

I don't understand, if you have a 3d model, why do these gifs need to be so low res and aliased? The AI isn't generated gifs, why can't they properly render the previews in higher quality? The magic3d models don't look that much more detailed, they're just rendered properly...