Google sent out email notifications to those who use Google Posts that they now expire after six months. Ben Fisher shared a screenshot of this notification on Twitter that read "did you know that after 6 months your most recent posts won't be highlighted on your Business Profile."
Here is a screenshot of that email:
So Google tells you "to keep attracting customers, get into the habit of sharing updates, exclusive events, and more."
Some Google Posts in the older days would expire in only 7 days but that didn't last.
Forum discussion at Twitter.