What happened to Brand has nothing to do with the legal system, yet. He may or may not face legal proceedings. But as a celebrity who makes his living on social media, he both explicitly (terms of service) and implicitly bought into all that entails. That includes accusations made against him as a celebrity, whether or not those amount to a prosecutable crime. Google/YouTube are not the government or legal system, they have their own standards that Brand agreed to so he could profit from posting his content.
No one has a right to a social media platform. Brand does have a right to fair treatment under the law. It won't surprise me if he finds a way to monetize the accusations against him.
If you don't see the hypocrisy of celebrities leveraging social media to their advantage and profit, then whining and complaining about "free speech" when they cross the line or break the terms of service or otherwise run afoul of the rules, I don't know what to say.