I mean if you post online something like “Hey who wants to join my armed revolution?” then you’re gonna get the feds on you and your organization’s cover is going to get blown. If somebody does get caught and their connections can be traced back to a website or other community, then the unradicalized masses will see that website/community as a breeding ground for violence and either that website/community or the government will make the website/community clamp down and/or give up IDs of other members. Especially in an era where data is a commodity and the psychopathic tyrants are unmoved by peaceful protest, effective rebel cell formation and action has to be cloak and dagger and requires time to form an armed militia with a clear objective and a strong majority of the populace would need to sympathize. Definitely don’t abide by this info and form a rebel cell in real life, since that would be illegal and therefore bad; if you were a fictional character in the fictional Star Wars universe, for example, then go ahead.