The thing is that FIDE isn't really doing anything. This has been mentioned elsewhere in the comments, but what they really need to do is take this seriously an

The thing is that FIDE isn't really doing anything. This has been mentioned elsewhere in the comments, but what they really need to do is take this seriously and hire magicians, GM's, ex-intelligence, etc... to assess the situation and with transparency provide recommendations on how to move forward. If you look at FIDE's statement, they basically said they were made that Magnus did this and they're using "sophisticated" techniques to prevent cheating. I don't think that is a responsible way to act, given that this presents an existential threat to the sport. With today's system, there is no way to get proof of cheating, without catching someone red handed, and there's no way to bring awareness because FIDE is either not interested, incompetent, or both. Also, there might be a lot of cheating in chess, and it could be just an ugly secret that they're protecting.