@gargron Overt harassment is one of the reasons quote-tweets are harmful.
Opt-out could solve this, but ONLY if it's retro-active, and deletes already existing quote-toots.

The other, far more common, way the feature is harmful to Twitter is that it encourages people to believe that amplifying harmful voices is the correct and proper way to respond to them. But in practice, Twitter has shown that amplifying harmful voices, even to criticize them with a brilliant bon mot, normalizes the harmful voices and helps them gain acceptance.

I don't think that opt-out solves that problem, because the most harmful voices are the ones most eager for any kind of attention, so of course they'll opt in.