We’ll initially be rolling this out to users with more than 50 reputation points.
This statement appears to be wrong, as denoted by this non-Discussion Discussion, and this Discussion code-dump, started by users with less than 50 reputation on an post. I'm assuming the second, incremental, rollout hasn't happened yet, because if it has, that's not really incremental as it just went live for everyone else.
It appears that at least one spammer account has (ab)used the feature in this post.
As of 2025-03-06 this problem appears to be back. For example both a 23 user posted this discussion comment in Discussions, while a 31 reputation user posted this discussion "Thanks, this helped me" in Discussions in response to answers.