What's the next step? To abolish negative reviews altogether?
Steam is a commercial venue aiming to sell.
It's been a while Steam achieved the suppression of negative reviews through various means (social control) as negative reviews could hinder sales potential.
Actually, Steam are so rich in positive reviews they can afford to sacrifice some of them.
Crowdfunding, if not a con itself, shares a lot of common points with cons. One is that, for conned people, a solution to get out of the con with limited damage, is to feed the con with other people.
Backers are deeply interested in painting their crowdfunded product in a positive light as crowdfunded devs compute in terms of work hours. Reporting negatively might mean scaring away potential buyers and therefore not increasing the work hours provided to devs.
Steam forums have their lots of example with people (most pf the time, intoxicated by the rule of law thingie) answering genuinely to any enquiry about buying the crowdfunded product. The reports are factual. Then come members of the army of light who counter act to avoid losing potential buyers.
In rare occurrences, some admitted that the product required much more developpment (work hours) and thus, reporting factually on the product jeopardized the prolonged efforts as it spooked newcomers.
Backers have an incentive to paint the product in good light, no matter what.
Steam sacrifice that segment even though keeping them a seat (separated but equal) It is not about positive reviews. Steam have too many of them.
Steam has failed to find new lines of revenues (like steam boxes) They are in a position they cornered the market.
They might even be at the position the volume of Steam products sold is increasing, but the volume bought through their Steam platform is decreasing.
It is all about the services provided by Steam like forums or their review system (added value) Any person buying a steam key elsewhere questions the added value and then questions Steam commercial activity.