That's a stretch to call any new website, especially with the market share of Lemmy, a common carrier.
By that reasoning, narcotics mules are common carriers. "I didn't know it was H in that bag in my bum! I thought it was a recipe for oatmeal cookies! Don't blame me!"
Edit: I should add that I would love a broad classification of simple facilitators like email and Lemmy etc. as common carriers. Just doesn't seem likely with the lobby man-hours working to prevent even true common carriers from getting that classification.
Fair. I picked another activity that's illegal on its face that stood out for its absurdity. Now I'm researching when Usenet or email were ever classified as CC, hopefully benefiting from this discussion.