The article above says Mr. Money Mustache's response in part was to "lock down" the mmm site that has the kisstrust.com is a "scam" post. To me this is just one sign that kisstrust.com's threat of legal action has some merit and is being taken seriously by MMM's attorney(s).
Pete's being all cavalier about this. My take is he is going to get quite an education on how long and tiring lawsuits can be. He won't win legal expenses here. He will be distracted from the main purpose of the site. Pride goeth before the fall.