Where I don't disagree with anything you say here, someone who contributes to a project with a license like this should already be aware and have accepted that it may ultimately be taken out of their hands, and that's fine if that's what they want to do. In fact, I prefer it for some types of software (I can't think of a better way to promote adoption of reference designs such as TCP/IP). That said, if the idea of working with a group and losing control or access to it is a problem for you, then by all means don't do so and tell others of the risks.