Is there any official policy for mandatory use of [the spoilers features](https://scifi.meta.stackexchange.com/questions/1/is-it-important-to-mark-spoiler-questions-as-such)? Or is just a courtesy/fully voluntary?

I didn't see anything [on the FAQ](https://scifi.meta.stackexchange.com/faq).

Is there any particular action that should be taken on posts that do not contain spoiler blocks?

If there should be such a policy, [should it have a statute of limitations](https://meta.stackexchange.com/a/114882/149367)? I'm pretty sure we all know who Luke's father is...

Also, for [examples like this](https://scifi.stackexchange.com/questions/7176/whats-with-the-duck-pond), I understand that there might not be much left if you blotted out all the spoilers. Should posts like that be handled any differently?

I have looked at [this question](https://scifi.meta.stackexchange.com/questions/455/do-we-have-any-sort-of-spoiler-policy) but I feel it was not fully answered by the question it supposedly duped. [The original question](https://scifi.meta.stackexchange.com/questions/1/is-it-important-to-mark-spoiler-questions-as-such) mentions how the spoiler block and spoiler tag work, but does not mention how posts should be handled that contain unmasked spoilers.

Also see [this network-wide question I posted on MSO before coming here](https://meta.stackexchange.com/questions/114876/policy-for-spoilers-on-fiction-or-literature-sites).