This is absolutely the right move. As stated, freedom of speech does not include the right to incite actions that would endanger others.
In the case of the QAnon conspiracy theory, there have been numerous recorded instances of real world violence, doxings, and other harms against others being committed in the name of the QAnon conspiracy theory. Additionally, in the U.S., the FBI has identified QAnon as a part of a group of “conspiracy theory-driven domestic extremists”.
So yes, freedom of speech ends when it causes real harm to society. Also, freedom of speech does not apply to private platforms like Patreon.
Many people are shocked to learn that the First Amendment free speech guarantee, along with all constitutional rights, only protects us against the government. So, if the government interferes with your freedom of speech, you can bring a First Amendment lawsuit to challenge that. And that’s true whether we’re talking about a federal government official or a state or local government official. But guess what? Facebook, Twitter, the other social media platforms are not the government. They are private sector entities, and therefore, they have no First Amendment obligation to protect your freedom of speech.