I'm going by the blurb here, since I can't read the paywalled article. If this is an industry-wide problem, why is it (only) Amazon's job to fix? What role should the merchants who use Amazon as the marketing and delivery platform have here? What about other companies that sell on-line, independent of Amazon? Do they have the same problems?
Now I'm sure Amazon has responsibilities to merchants where they act as the delivery agent (in both directions). Of course, when something costs the merchants (including Amazon itself), those costs get passed onto consumers. But that's "cost of doing business," but if some small number of customers are disproportionately responsible for (fraudulent) returns, maybe that's where the actions should focus. I dunno, but the summary of the article raises many more questions than it answers.
(And after listening to Yet Another "investigative reporting" piece that blames an industry in Corporate America for a whole bunch of problems, some of which are definitely caused by industry practices, while others are ramifications of the business or of -public- policy, I'm getting pretty sick of the trope "corporate America is to blame, no matter what the problem." This piece was about probably bad practices in food processing, but are we ready to shut down "Big Agriculture" and pretend we have an alternative way to feed millions, if not billions of people?)