we would advertise Hive and give a call to action for anyone who reads it to join, follow the authors involved, or, better yet, get writing and submit their own work to the next collection.

You got to be very careful about that. As it can be seen as breaking KDP policy and can get a book pulled and you banned. While they generally allow someone including a link out to their own website. It’s not the same when you are sending people to a blockchain instead of the author’s personal website.