Because it would probably be overrun by the very opinionated. This happens frequently with new political parties: Someone starts an organisation, it get some a

Because it would probably be overrun by the very opinionated. This happens frequently with new political parties: Someone starts an organisation, it get some amount of traction. Suddenly a lot of new people join and turn the whole thing into a tool to spread their views. AFD in Germany started like this, it almost happens to The Pirate Party, one can argue that Green Parties tend to suffer from this phenomenon.