@dailywafflebooks @mom @willaful Some people do crosspost from the other site but still engage here when someone responds to one of their posts. That's probably not quite the same as if they were here more, and responding to other members' original posts, but it's better than people who're only using the crossposting apps to broadcast here.
But authors may be trying to keep up engagement on Facebook, Instagram, Ticktok and their websites/blogs as well as here, which must be a lot of work.