I can answer this one... I think. So being as duplicitous as I think I am I have more than one email address - shocking yes I know. So as a “commentator” on CD vlogs under one particular name I said how it was. Never nasty or trolling, just being straight. Now on the device I used to make that comment under that name the comment would be there for me to see. HOWEVER, when I went to another device, opened YT using a different profile, clicked into CD vlog I’d commented on on previous device, the comment is not there. So on iPad as John Doe, there’s my comment. On iPhone as Jane Doe, cannot see John Doe’s comment. So I assume John Doe is blocked from commenting even though they are visible to him on device he used. Second HOWEVER.... if John Doe “replies” to someone else’s comment, that reply is visible on other devices. Seems like only the main commenting is banned but replies get through. Believe me... took me a little while to suss this out but that’s how it works. So seems Nati or whomever has the power to block/ban a commentator. I think for a while she used to just delete my comments then she went the extra mile and banned me...