I agree it's a huge problem. However, I don't think the solution is censorship by tech oligarchs. A fake review is still speech, and if you believe in free speech and free expression as a social (not legal) principle, I don't see how you can support Jeff Bezos deciding which speech you are and are not allowed to see. The solution to harmful speech (which fake reviews are) is more speech, not censorship.

"I may not agree with what you say, but I will defend to my death your right to mislead people with fake reviews"