If a thread started for ‘best X of 2023’, I’d be pretty sure of the results.
Probably you could even generate new questions every time with GPT, so that people couldn't cheat. This system would have a million problems, sure, but would it have more problems than the current system?
Why is it important that you, a person apparently unwilling (hyperbole aside) to prove that you have actually read a particular book, should be able to transmit (ostensibly) your opinions about said book into the heads of other potential readers via a software platform? A small number of verified reviews is almost certainly better than a large number of unverified reviews, for exactly the reason highlighted by OP's article: when there are few or no controls on who or what can post however many reviews, the system is inevitably exploited by bad actors, and said actors often operate at scales that dwarf the impact of a single legitimate reviewer.
For example, Facebook/Instagram/OpenAI/etc. requires non-VOIP phone number verification on signup. This alone would cut spam to near-zero.
I’m sure if Goodreads required this on signup, the problem would solve itself.