Disgusted by the spin. They are making it so more people will pay them by saying "we are more open and free". Dishonest.
As an end user, if you care about free software- this is good news. Instead of having different "Enterprise" and artificially handicapped "open-source" edition, we get to see everything out in the open. The secret sauce is now limited to the release process. They say openly that if you need to, fork them and create your own releases - yeah go for the "knockoffs" if you can trust them - or else try the branded (Chef) product.
MongoDB got a lot of flak for misappropriating the name "open source". What Chef is doing is IMHO more clear and honest. They need to make money too.