I don't know why you're being downvoted when it's clear your question is out of curiosity.
High effort reviews are common on Goodreads, why? Because it's a community about passionate readers and probably those who write the very detailed reviews have enjoyed reading some other reviews and want to contribute back to the community. I think it's the same reason as people contributes to wikipedia: for the sake of sharing knowledge
> I don't know why you're being downvoted when it's clear your question is out of curiosity.
It is an odd question on the internet where people regularly and normally put a lot of effort into reviews, blog posts, discussion forums comments and so on.
That coupled with question about affiliation probably makes people interpret is as not questions out of curiosity, but rather as sleazy way to introduce doubt on the author motivation.
High effort reviews are common on Goodreads, why? Because it's a community about passionate readers and probably those who write the very detailed reviews have enjoyed reading some other reviews and want to contribute back to the community. I think it's the same reason as people contributes to wikipedia: for the sake of sharing knowledge