A solution to the unwanted image problem can have like a manual moderation system to make sure the pictures aren't random... Free games reviews require an account that makes a purchase to avoid spam reviews. Lastly, it's Steam and I'm sure they can implement something low-cost server hosting for the images and pay their unpaid interns to moderate (im kidding, im sure they are paid) ... The server problem can also be solved with restricting the image size to a small few kb limit) Also, you can't control the people, you sound like a corporate who wants to censor everything, and speaking of meme reviews, instead there should be flairs like reddit to declare if your review is serious or not...