By joining at least he will know he has people supporting him. I’m sure the commie left will try to get names of ‘Truthers.’
(Not facts ‘Brandon’, but truth!)
I would have thought that if Truth were only a platform for him to get his message across. But it's also his investment. He needs Truth to make money. To him people joining Truth is more about the success of his business than knowing that people support him.
Notice that unlike Twitter you can’t even view Truth’s homepage without signing up. He wants first and foremost people signing up which is the single most important thing to his business.