They *should* be fine. But if Unsplash isn't policing their contributors - and how can they? - there's always scope for mishaps, I guess. Anyone can contribute to these sites and some people abuse it. I'm sure cases of legal action are relatively rare, but it can happen. I looked into it more thoroughly and wrote this: https://medium.com/illumination/people-are-being-sued-for-using-creative-commons-images-adc5c8ba1491