It seems like you're claiming the success of Patreon is due to its support of the concept of "Free Speech", and by not allowing certain groups to use their website as a platform to spread their message (for example, hate speech), they're in violation of their founding principles.

Correct me if I'm wrong, but isn't it up to them who they want to do business with? What is the obligation this non-governmental entity has to act as host?

In a sense, wouldn't forcing Patreon to be open to all (again including groups with a message of hate and inciting violence) be a violation of their rights?