All marketplaces have these problems, I would argue. If they don't, it's probably just because the "scammers" and product "spammers" haven't found it or focused on it yet.
As long as you let such individuals into your marketplace without any oversight or data-cleaning requirements, you will have this problem. It's like email and spam all over again.
No this is a problem unique to Amazon because it has both a marketplace filled with third party sellers and an official brand both operating on the same site without highlighting that the marketplace is less trustworthy. If you want to buy an Asus mainboard then you won't be brought to a seller specific page. Instead there is a product specific page that bundles first party and third party sellers onto a single page and both will appear in the search results. The conflict of interest is pretty obvious. Only Amazon sells the "AmazonBasics" brand and by making all non Amazon brands look untrustworthy through third party sellers they steer people toward buying the Amazon products.
There are thousands of retailers out there, Amazon seems to be unique in having this problem at scale.