You have the right to say (almost) anything you want. I have the right to tell you that you can't use my microphone. Someone else has the right to build a microphone tailored for you.
So I suppose you are all for Comcast, AT&T, etc. injecting ads into your traffic, charging premium for your Netflix binges, and worse?
I mean it's their ~~microphone~~ fiber.
Oh, but this is different, I'm sure you'll say, because reasons.
Well that's why we generally, in the US at least, have always thought it was a good idea to just allow all speech, even if some awful stuff leaks out once in a while.