I have nothing against AA or Goodreads, and have never heard of BookWyrm before today, but the main thing I use Goodreads for is providing a link for a publication that has accurate info (full correct name, correct name of author, date of publishing, ISBN, etc) that does not involve an Amazon or other sales link.

But it won’t replace Goodreads for me, because of this:

Write reviews or post casual commentary as you go, and control who gets to see your posts with granular privacy settings.

From joinbookwyrm.com

It’s like Facebook for book reviews. I couldn’t even see a book myself because it’s all locked down. And like Facebook if you have to create a private account to use it I’d never go there anyway without seeing it first, or specific interest in what it offers. (I’m one of those rare never-Facebook people you sometimes see in the wild, lol.) If I had been unable to browse Lemmy before joining, I’d never have joined.

Facebook overcame its initial participation hump by being .edu only, very exclusive, and word of mouth. They have coasted on that word of mouth factor ever since, because now it’s baked into the media and daily online life. But they couldn’t do it from scratch again today. So unless you unlock BookWyrm in some way, or its exclusivity becomes a major draw in itself, I don’t know how it will overcome that initial participation hurdle.

I upvoted your post and absolutely support your goal in theory, but as someone who never joined Facebook, you could never get me to join a Facebook for book reviews, sorry.