They specifically ask not to share the link, and I am inclined to follow their request. I don’t know their reasons, though. Maybe it’s like zoom where you have to pay more money depending on the number of participants? Or maybe they just want to know who the participants are. (Which sounds legit to me, as they are the organizers.)
That’s what I figured and it’s understandable. I just didn’t know of a way to actually restrict access on YouTube, so I was curious.
Oh now I understand what you are asking. I don’t think the link is restricted in a technical way, they simply sent it to me in an email without asking for my YouTube account or anything. Plus, they ask not to share it, which to me is the ultimate indicator that there is no protection on the link.
I just signed up and was told on one of the pages that there were still 109 available slots. In the final confirmation mail there is also a button to return your slot if you cannot attend.
I saw a tweet today that really reminded me of this book and I thought to just share it:
Also looking at the comments, some people pretty much resemble the people Keiko met up with at some point during the book 
But at least a good portion seem to support this person’s decisions
You are entitled to, even!
Don’t worry, I suffer the same fate 
Just dropping in to say I started the book now. I know there was some interest for a re reread club, but I just wanted to read something chill after 秋の牢獄 and started. Making good Progress and finished 5 weeks of bookreading in 1 week 
It’s a really easy ready for me now and i understand why it is recommended that often.
I will drop in again after having finished it (probably around Christmas?) and write down some of my thoughts.
I would also be interested. コンビニ人間 has been on my want-to-read list for quite a while now.