In general, the concern is copyright ownership. Under U.S. law, work made for hire usually means the hiring party—not the photographer—owns the copyright from creation. That can be a major downside because you may lose control over how the images are used and may not be able to license them again later.

If you keep copyright instead, you can license the images, control future use, and potentially keep earning from the work. Without that ownership, you could even need permission to use images you created for your own purposes, depending on the agreement.

That said, work-for-hire is not automatically bad. It can make sense if the compensation reflects the fact that you are giving up copyright and future licensing value. The real risk is agreeing to work-for-hire terms without being paid enough for those surrendered rights.

So the key issue is not that work for hire is always dangerous—it’s that photographers should understand they are often trading copyright ownership and future income potential for upfront payment.