Recently found out that Goodreads is owned by Amazon and now I'm uncomfortable with my now 9 year old account there.
Considering deleting it and not replacing it with anything because honestly I never really used the social features there, just to keep track of books I've read.
I could just do that with a spreadsheet or a text file.
No *exact* alternative, but a lot of overlap with these services:
Internet Archive's book site, includes pages for every book ever published.
Ecosystem for DRM-free eBooks, store them, rate them, have reading lists etc.
You can follow them at @libreture
mastodon.at is a microblogging site that federates with most instances on the Fediverse.