Let me put a phrase into your mind: nonconsensual virality. It's why quote-posts on Twitter led to harassment. People's words stolen, taken out of context, used purely to incite a mob of griefers. The answer is to give #Mastodon users control over whether someone else can quote-post them, with a simple "quote or not" setting that can be set before or after the post goes up. We should be allowed to stop people from taking our posts viral without our consent.