Because "engagement" is about "money" and "ad" and "sponsor" and "business"... and not about anything close to "social" or "society" or "human". So, sooner or later (but most probably "sooner"), you'll see clickbait and other usual tricks to grow up "engagement"... and any interesting post will disappear
So I won't even matter to create an account or have a look. I'll wait for the next one, or the next next one... hoping some people will understand that quality content is not measured by some kind of "engagement"
EDITED: if you matter enough to downvote, at least explain WHY you think I'm wrong ;-)