Do you think that Amazon doesn't already filter fake reviews? Also, people are already unlikely to write reviews, how likely do you think they are to keep writi

Do you think that Amazon doesn't already filter fake reviews? Also, people are already unlikely to write reviews, how likely do you think they are to keep writing reviews if their reviews keep getting flagged as fake? [Disclosure: I work at AWS, but I really have no idea how any of this review stuff works]