Not a neuroscientist either but I would imagine that raw data without personal information would not be useful for much. I can imagine that it would be quite valuable if accompanied with personal data plus user reports about how they slept each night, what they dreamed about if anything, whether it was positive dreams or nightmares etc. And I think quite a few people wouldn’t mind sharing all of that in the name of science, but in this case they don’t seem to have even tried to ask.

What if you gonna think about your social security number 30000 times in your dreams, and someone knows the pattern? See the danger? That's evil.