Well, look at what happened with Alex Jones and his Sandy Hook theories.
If they cause measurable harm to others, then yes media companies have a responsibility censure people on their platforms who spread conspiracy theories.
But who is keeping score? You can't censure Alex Jones and QAnon, then give the MSM outlets that pushed the Steele dossier a free pass. They caused measurable harm to an entire nation. Most of QAnon is innocuous, even if conspiratorial. I'd argue Q is far less dangerous than a national media outlet that knowingly pushes dangerous narratives.
Well, look at what happened with Alex Jones and his Sandy Hook theories.
If they cause measurable harm to others, then yes media companies have a responsibility censure people on their platforms who spread conspiracy theories.