UPDATE: This might not be as bad as i first thought. Please read this post first!
I just saw this was posted by the Cathedral on their site:
It is a long text in Spanish, but the core of it all is this paragraph:
Con el objeto de evitar perjuicios a todas aquellas entidades que están expidiendo credenciales se les concede una moratoria para que puedan utilizar las mismas: hasta el primero de abril de 2016. A partir de esa fecha sólo se admitirán para expedir la "Compostela", las credenciales oficiales de la Oficina de Acogida al Peregrino.
Starting April 1st 2016 compostelas will only be given to pilgrims that does present the official pilgrim passport (credential) issued by the cathedral of Santiago.
It is also mention earlier in the text that the price charged for this credential should not be more than €2,-. For those that already sell the cathedral credential, like the Forum Shop.
I hope I read all this correctly, please correct me if I have misread this...
Greetings from Santiago,