I understand that LP does not want his artwork to be published, it is his and he decides.
I am not the one to criticize who and why decides to pay 38€ for something. If they want to pay it, that's fine.
LP is very free to cancel the subscription of whoever shares the pics without his permission.
But I find it absolutely intolerable, unfair and senseless to threaten customers/members, who are paying around 38 € per month, with no more pics; the pics what they are paying 38 € for. You can not threaten with a kind of collective punishment for what a person does. Basically, I think it is simply a bluff.