Arguments about whether Twitter is subject to FoS aside; censorship would entail deleting tweets, not rejecting adverts. Speech is not reach. Freedom of Speech

Arguments about whether Twitter is subject to FoS aside; censorship would entail deleting tweets, not rejecting adverts. Speech is not reach. Freedom of Speech is not the right to be heard, it is the right to speak your mind. If people decide to not listen to what you say (followers), you have no right to force them to (adverts).