For various things (certain electronics/peripherals, certain tools) I deliberately avoid Amazon because I want something I can trust and don't have energy to decide which of the fifteen similar-looking things on Amazon is well-made and which is a fake or just crap.
That Vietnamese company with the 3x capacity:price ratio is probably selling junk. There are just so many more junk sellers (at least by name—maybe a handful operating all those names). So it boils down to taking a gamble when the odds are against you, getting lucky, and building a relationship or going to a retailer you trust already.
I've had great luck in these situations buying from a small company that filtered out which cheap brands were good products. However I already have some other reason to trust those small companies.
You also can tell low quality products for the poor English/Grammar and knockoff similar brand names.
Amazons search really sucks quiet often a long tail search term will return product that in no way matches searcher intent.
> Companies are amoral
This is presented as a truism, but it is not true. Companies can be as moral as they wish to be. One of the reasons we have found ourselves auctioning off the arms and legs of American industry to China is this race-to-the-bottom mentality of "it's just business" that prioritizes short term profit over the long term viability of a company. Yet those companies have lobbyists, marketers, and advertisers, which they use to fight expensive battles in the marketplace and regulatory forum. Some companies even have the benefit of being under the same ownership umbrella as a venerated newspaper or popular cable news network.
Morality doesn't dissipate into thin air just because a few people throw their lot in together and try to make money. Apart from having financial incentives to do no harm to their customers or areas of service, companies have the capacity to make decisions based on reasoning about what is right and what is wrong. There is no fiduciary duty to do harm for the sake of profit.