Whenever I tried to respond to a "can't read the paper, it's behind a paywall" comment on reddit's /r/science with a link to Sci-Hub it was removed by the mods.

Whenever I tried to respond to a "can't read the paper, it's behind a paywall" comment on reddit's /r/science with a link to Sci-Hub it was removed by the mods. Actually, it was not even ever published (but all my other comments were), so I guess they may even have a bot do this. Can anyone confirm, and/or say something about their reasoning? I don't see that forum's admins' role in defending the commercial publishing model.