It clearly takes jobs from many places and concentrates them in areas where Amazon has facilities. This undermines economies in rural areas and small cities (largely inhabited by “deplorables”) since previously the “sellers” were locals who also bought local goods, and now the sellers are in major cities.
It isn’t clear how this impacts on quality of jobs. Small businesses paid poorly, but there were many opportunities to advance. Most of the major retailers started out as small poorly paid retail operations. An argument can be made that for most Amazon workers, it is a dead end job with no hope of advancement.