This seems like how I treat semi-public content I write not intended for an audience. Sure it’s technically available to the public, but it wasn’t intended to be consumed by the public. I’m obscure, my content is usually obscure, it being spotted and becoming more widespread is unexpected and makes me reconsider lack of caution in anything I might have said for my own purposes.
In the digital world, this hits a wall of “the security mechanisms don't integrate with the nuances of human social understanding directly” and gets split off into “posts that are technically public but not really addressed to the public” and “invite-only areas which would probably be okay being somewhat more open but lack a good way of moderating this without leaving things open all the way”.
If it is online, it is public. I’m not understanding why that wasn’t the expectation here.