That author keeps referring to the “end of their sigmoid curve.” It’s not a sigmoidal function; new accounts aren’t finite. If engagement took off again, they c

That author keeps referring to the “end of their sigmoid curve.” It’s not a sigmoidal function; new accounts aren’t finite. If engagement took off again, they can have another log phase. He’s just bandying about a technical jargon term to try and look mathematically insightful when he means to say “growth has slowed.” But that doesn’t sound fancy enough.