I’m effectively doing 02 on my site, although I’m prepared to do 03 if that becomes a real problem. When in doubt, I default to 01, of course; I do accept mentions of deletes and honour them automatically, and if the platform you’re commenting on doesn’t send these mention, you shouldn’t have used that platform. I know it’s rude, but TBH I’m sick and tired of the infantility people approach their public speech with.
05 is a thing I would absolutely love to do, and will do as soon as the legislation changes. As it is now, I can be held accountable for what my website shows to a reader, and embedding something that can be changed without me knowing, resulting in legal actions against me, is not exactly what I keep my website for.