As others have pointed out, alternatives do exist. They just lack the network effect.
I've recently moved to Bookwyrm.
I was able to move import my Goodreads list, although many books were missing.
Any new books i'm reading, go on Bookwyrm first. I had to add the ISBN details etc. for some. It's a bit of work initially, but atleast i feel my contribution is going to a non-walled garden.
>BookWyrm is a social network for tracking your reading, talking about books, writing reviews, and discovering what to read next. Federation allows BookWyrm users to join small, trusted communities that can connect with one another, and with other ActivityPub services like Mastodon and Pleroma.
Beware that Bookwyrm is neither Open Source (as per OSI definition) nor Free Software (per FSF definition). It is legally impossible for a lot of people to deploy it, I think it even include myself (I am employed by a company, does it counts as "laboring for myself" in my country?)
I've recently moved to Bookwyrm.
I was able to move import my Goodreads list, although many books were missing. Any new books i'm reading, go on Bookwyrm first. I had to add the ISBN details etc. for some. It's a bit of work initially, but atleast i feel my contribution is going to a non-walled garden.
----
https://joinbookwyrm.com/ - Social Reading and Reviewing, Decentralized
>BookWyrm is a social network for tracking your reading, talking about books, writing reviews, and discovering what to read next. Federation allows BookWyrm users to join small, trusted communities that can connect with one another, and with other ActivityPub services like Mastodon and Pleroma.