I personally love email. It fits how I do things. I can take the time to compose carefully, it supports more than a sentence or two but is also fine for "me too!" comments, it is a fine quick-n-dirty file transfer tool (so long as you're not mailing a kernel source tarball or pile of RAW images), and, I think most importantly, sets expectations properly.
I miss the pen-pal days of emails between friends.
Email really should just be used for 1-on-1 communication that's not meant to be read by anyone else other than the sender and recipient.
It also will shift the burden solely to you to answer any questions or provide clarification. If recipients were able to see other recipient responses, they could do some of the work for you.
But, for all the use cases I can think of with regards to sending messages to multiple recipients, I cannot really think of a good reason to prevent recipients from seeing other recipient responses barring some communication of a personal nature.
Think of it this way -- would you want someone else deciding how often you'd look at their web page?
So if that person clicked link #1, the token in the link is verified that it was created for that email address, and then it's noted in a database. In the future, if person X sends another email for that category, it won't go to that person. I'm thinking the sender wouldn't even know that the person unsubscribed
And joke emails? Seriously I'd anybody wants a joke, they can Google that. No good reason to interrupt others.