"Speech" in terms of the context in which you've been trying to use it means that you're free in an open forum. Speech would be going out on to the sidewalk and saying things to people. Speech would be your ability to make a platform like YouTube for others to make videos and say whatever they want.
Just as you do not have the right to demand air-time on ABC news to rant about whatever you want; you do not get the right to demand space on YouTube to rant about whatever you want either. When you post on YouTube (or Lemmy / Kbin / reddit) those things you say are not "speech." The posts you make are content for someone else's platform.