The problem is mostly solvable. Review quality went downhill when Amazon decided to let 3rd party sellers run rampant, in order to boost their margins. A decade ago or earlier, when they had a handle on their supply chain, the reviews were pretty reliable. They can always go back to that model, but the smell of a greenback is too intoxicating for this to happen.
Notice that Walmart, Newegg and other wannabees are going down the same route. Typical cases of crapification of the late stage, overfinancialized capitalism.
> The main point of my comment is that when economists spend 10 years looking at data and arguing out every detail, they conclude that immigration is increasing jobs and increasing wages.
Economists look at the past and extrapolate into future, often with really poor results. With increasing amount of automation, software development is probably safe from paradigm change for a short while. Given that, it is always risky to claim that immigration will increase jobs and wages in the next decade, because it did so in the previous one.