If anyone tried to launch an UL-type business that independently audited the security of consumer networking products, 1) nobody would ever invest in it, because 2) no manufacturer of said products would ever work with them. The average consumer in the US has no fucking idea what that UL mark means, or that the Underwriters Laboratories is even a thing that exists. The UL has been around for decades; when it came into existence the market was a much different place. Back then you could justify the increased costs associated with getting the UL stamp of approval as a benefit to the consumer's safety. Today, if you tried this, you'd get absolutely buried. First, the market has no fucking idea what SSH is, or what information security is, or even what "networking" is. While someone doing the buying for Walmart and Target knows that the UL mark has value, and "that's how we've always done it", and because they can turn around and throw the UL under the bus when some of their cheap Chinese junk shorts out and burns down a daycare, they look for the mark. If your discount-bin consumer router has more holes in it than Ronald Reagan's memory, generally nobody dies, or sues, or even knows that there's something wrong. There is no market value in getting these products checked out by a UL-style enterprise. All that will do is increase costs, so with the razor-thin margins that Walmart and Target crow about, they will either 1) buy a cheaper brand, 2) demand that the manufacturer sell them a product that isn't certified (because it's cheaper), 3) raise the price to the consumer (not fucking likely, and even if they did, if the average mouth-breather sees one "internet thingy" for $50, and another "internet thingy" that's $55, they will buy the cheaper one.)
Maybe in 50 years when networking knowledge is more widespread (perhaps on the level of how to operate a car [obligatory car analogy]), then you'd be able to explain to Joe Sixpack why having their home router checked out by an expert is worth the extra money. Today? No fucking way.