Internet providers and services aren't "public forums" given their infrastructure is not a public space, but a private space they control. Whether or not someone thinks these services are "censoring" things or not isn't a real argument, again for the reason it must be a ruling authority that violates law by removing a person's speech from a given area or location, which then is censorship.
A company can't censor someone who is on their platform given the platform is owned, not ruled.