That was a requirement given for being a new mod at /r/the_donald. There is also a separate, new rule change revealed in the recent "Transparency Report" that says that users who consistently upvote rule-breaking content will be banned.
> The whole point of a quarantine is exactly to push people to report bad content, and acts as a warning. This new change makes sense as far as pushing people to report said content and not keep promoting it.
That may be the case. On the other hand, that may only be the pretense. Every four years we see the same thing happen on Reddit. We saw massive upvoting of anything related to Obama, which at that time it was just thought to be organic (and maybe it even was).
Then in 2016 we saw massive Bernie Sanders support to a swift and sudden change to Hillary Clinton support. That was followed by the "Correct the Record" movement and then later "Share Blue." These were all coordinated efforts to inorganically promote one political party and suppress another.
But that wasn't enough to keep r/the_donald posts from regularly popping up on r/all. That's when they quarantined it. Now they're taking it even further.
Before, political minority users may not post out of fear of being downvoted or targeted by those searching through their post history, but they felt safe upvoting content they agreed with. But now, there is this implication that they could face repercussions for simply upvoting the wrong thing.
Sure, we're told it's only for things like illegal content or racial slurs, and only in quarantined subs. However, we'd be stupid not to see the political bias on Reddit. There's ambiguity over what counts as the wrong thing to upvote. They don't tell you what content you upvoted that you're being punished for. The net result? The "wrong" type of political content will be naturally suppressed by users now being reluctant to upvote it.