Thing is:
EVERY YouTube channel I now visit features no comments.
Is that the case now for you, too..?
I mean if you have a registered YouTube account, etc.
...?
Could be your ad blocker, if you use one. Alternately, it could be browser type.
I’m looking at Youtube right now and their comments sections are very much open and available. Also, users can disable comments on videos; this has been the case for many years.
I’m a registered Youtube member. I can post comments.