Maybe I am just fortunate to have not had an issue, maybe the counterfeiters are very good, or maybe I am just clueless, or some combination of these.
I try to stick to only name brand items. If there is a product that looks compelling but is from a brand I have not heard of, I generally look at both their website and other reputable retailers which sell that same product.
I largely ignore the reviews. Not necessarily because they are scammy (which I’m sure they are) but because they are so largely subjective. Reviewers will often give a one-star rating for a product because shipping was slower than expected. Or a one-star because the product didn’t package a standard USB-A cable or didn’t include AA batteries. Or a one-star rating in protest something of the company or product itself. Many times it appears the reviewer did not read the description closely enough, and accidentally purchased the wrong product, for which they blame the retailer.
I almost always purchase from Amazon.com as the seller vs. some Harry’s Tech Supply Store. Exceptions are made if there are thousands of Store reviews and a 95%+ positive rating.
In other cases, I will simply purchase the item from the official brand website, or some other retailer. It’s frustrating that Amazon allows commingling of products from different suppliers and retailers in a common bin. It’s also frustrating that other retailers like Walmart and target seem to have followed suit.