Define the on-chain privacy problems being addressed

[nothingmuch]

Minor edits from https://gist.github.com/nothingmuch/d84ba390d89b5b08897af2d95009c2a1:

• soft wrapping
• remove paragraph that hedges against doomerism, as that makes sense outside of the context of the fungi repo

[bc1cindy]

I left a review comment https://gist.github.com/nothingmuch/d84ba390d89b5b08897af2d95009c2a1?permalink_comment_id=6295257#gistcomment-6295257

[nothingmuch]

thanks to for the reminder, i replied, will try work some of the suggestions in where i agree, and will fix the typos