People being able to create their groups however they want is a hill I'm willing to die on. One of the following two things will happen:

1.) The group will fill, thus meaning there was enough interest in their parameters that they were able to fill, so their requirements were not unreasonable.
2.) The group does not fill, which means there was not enough interest and they either need to change their parameters, or don't do whatever it is they were creating a group for.