I'm not aware of any other hobby I take part in where I have or even should, be a member. I can climb and walk without being a member of the BMC. I canoe without membership to the BCU. If I wish to canoe the local waterways I can. If I wanted to shoot some rapids, difficult in Norfolk
I can whether I have a BCU star or not.
I see GAGB providing that sort of level within the UK. They have members, provide sevices to their members, and even fight the fight for their hobby. They don't stop people carrying out the hobby outside of the organisation nor do they impose their rules on those not wishing to join.
At best GAGB can make itself attractive and even benificial to join.
Informed I agree with. GAGB should make people aware that the landowner agreements exist beyond one site. They should be trying to encourage people to join and promoting the guidelines etc through the membership.
If someone has an objection to the GAGB and does not wish to be a member then GAGB should not be trying to impose it's ideals on the individual via the listing sites.
We can only speak for ourselves as an organisation not others outside the organisation.