@sigmasternchen I don't think the major risk is smuggling a mole into the chat either. But I think it is also far easier and more likely for any adversary, not just law enforcement, to compromise 1 device of 1 user within a chat of 1000 users, than to go through all the trouble of either compromising the server provider or to compel them to cooperate, especially when the server provider is not in a nation with easy law enforcement cooperation.