Are you sure you're not thinking of "the first amendment" rather than "free speech"?
Irrespective of the first amendment, any given individual or company is free to respect the principle of free speech as much or as little as they like. I choose to respect the principle more than you. Thanks to free speech, we both have the express our disagreement. Because YCombinator respects free speech to some extent, they have furnish us a platform that allows us to publish these opinions.
Treating speech as a boolean is naive. There are a range of protections ranging from popular opinion, free speech devotees, all the way up to the first amendment.