Tech people love to talk about their “learnings” (presumably because they think that term sounds more innovative than “lessons.”) And tech folks sure have learned a lot of learnings this past week, particularly about assessing future growth and being more careful with how they spend money. That applies both to venture investors, a few of whom appear to have blown nearly $2 billion on Sam Bankman-Fried’s failing empire, FTX, and big tech companies such as Meta Platforms that are now retrenching after a period of overindulgence in hiring.