I wasn't (and I haven't read any of the books).
From the AMA:
Season 1 of Apple TV+'s Silo has ended, and while some questions were answered, we know you have many more! Today, we're happy to welcome the author of the Silo Series, u/HughHowey to an AMA with the Silozens of r/SiloSeries.
A majority of the sub has not read the books, so the mod team will be working under the assumption that those viewers do not want spoilers for future seasons. With that in mind, some guidance for participants on how moderation of this AMA will work:
Questions with spoiler content from Wool Chapter 30 and on, plus Shift and Dust, will be removed.
Questions with minor book spoilers from content already covered in Silo S1 (for example, questions about the book-to-show adaptation) are fine, but if it wasn't in the show and you feel it may ruin things for people planning to read later, consider using spoiler tags to mask your question.
The sub's rules still apply to this event. Disrespectful, aggressive, or inflammatory comments toward other Silozens will be removed.