It is clearly stated at the bottom at the page of the Sacred Rituals, that not only sharing but also talking about rituals is prohibited.
I think it's talking about giving away the actual secrets, methods, information etc., and not necessarily relating what is "on the menu".
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Tangent:
If anything these types of posts are a great incentive, as it creates a proper sense of intrigue and scarcity whilst still being gatekept for actual initiates. At least for the lower tier rewards it is a good method of incentivisation so long as enough information is withheld and remains mysterious.
It functions as a "tease" into the members only private club. Which creates a psychological backdrop that fascilitates more "reckless" spending, as there is a mental excitement which overrides people's innate defensiveness/stinginess and logical brain.
From a purely pragmatic/business standpoint, since I cannot speak on any other, there should be more "reminders" for people to donate and that these functions and priviliges actually exist.
Churches and Mosques create regular reminders, because people are forgetful and stingy, and always delay themselves when it comes to donating (even if they WANT TO donate, they still delay) and it is through this process of repetition that you slowly chip away at their "defenses" and those on the brink between "inert" and "active" eventually become activated, especially when they see the direct rewards their peers have benefitted from.
Most people, when it comes to their hard earned money, do not respond well to abstractions of the future, but prefer to actually see the direct results it will go towards... it is what it is.