That's not how the law works. If it did, your employer would be considered an accessory to whatever crime you commit. The law requires that the prosecution prove mens rea (ie that you knew you were commit when you committed it). So not only would it require a terrorist event to occur which Nick would have no motive to do, especially if, as you say, he is purely motivated by greed (there's no money in blowing things up), you would have also to prove that the superchatter were aware that's what they were doing.
Not illegal.
Perjury is specifically lying under oath in a court of law. You might be referring lying to a federal investigator. Both can be resolved by invoking your 5th amendment rights, By law, refusing to talk to police can not be used as grounds for suspicion (ex "He won't talk to us! That means he must being doing something bad!")
Nick did one interview with Milo two years ago and people come up with these fantastic theories about how Milo is Nick's second-in-command or better yet, that he is the secret string-pulling power behind the throne. I find these theories unpersuasive.
Nick may in fact be brought down by the feds. I mean, they are feds. But that's in the lap of the gods and I'll cross that bridge when I get to it. That said, the idea that Nick is going to be bring thousands of casual groyper fans down with him is absurd.
The feds know who all the Nazis are. If you ever commented on an Alt Right Youtube video, the feds know you are a Nazi. You need a Google to comment on Youtube and Google works with the feds. This notion that "Oh, once the feds find out that you are a groyper, you're gonna b in big trouble, mister."
