I think the problem is harder than you make out. How do you expect them to combat this while still allowing new sellers to have vast reach.
so who's doing the shutting down?
Are these fake items also accessible from the EU? I'd expect the EU wouldn't take kindly to these sort of scams.
https://www.amazon.co.uk/Mobile-External-Portable-Storage-La...
Amazon is paid to list it (they're "sponsored listings"), store it, deliver it, and profits from the sale. I think we can hold them accountable for the sale. It's somewhat akin to how "handling stolen goods" is just as much a crime as stealing them in the first place. If Amazon can't guarantee what they're selling, they shouldn't be selling it.
Right now new sellers do not stand a chance unless they work in a niche (and even then you can't find anything on Amazon anymore unless you already know brand name + model name).
These fake/spam sellers are clogging up everything.
Amazon could easily combat this, maybe not 100%, but 1-2 quality well trained human moderators (nothing outsourced, only focused on this single job, no other support roles) would probably be enough to signicantly improve the situation.
I am going to make the claim that I could clean up a product category by myself in a few hours.
I expect Amazon to control quality so that new sellers will have vast reach instead of Amazon becoming a toxic swamp that nobody goes near.