Why are they disallowed? And more importantly, why is this not transparent in the pinned post about Lemmy.one as a rule?

I was blindsided by this when I saw another user mention it, and while I enjoy Lemmy.one very much, I’m considering moving on because of this. I rarely, very rarely, down-vote, but at times it’s handy to push down misinformation or adverse content.

It feels a bit too much like YouTube and the removal of the dislike button to me. What are other’s thoughts?