This is a complete different problem. The theory in the case of youtube was that the collective downvoting was in someways spurred by being able to see the total. They didn't remove the ability to downvote, just the reward for doing so. Users are not penalized for downvoting.
In the case of steam users are negatively impacted by a moderation decision.
While I respect the contrast you're highlighting I disagree that they're therefore fundamentally different. In both cases its a form of social coercion to shape user behaviour to misrepresent the collective sentiment.
If it was a regular thing, perhaps. In this case it's collateral damage and not policy. Hanlon's law applies here -- it's far more likely to be incompetence than malice.
There are plenty of other negative reviews on that game.
The goal of the feature removal is obviously to hide (censor) the displeasure of the audience towards certain videos, so I disagree that it is unrelated.
In the case of steam users are negatively impacted by a moderation decision.