The mascot is friendly, vaguely memorable, well-proportioned, soft, and not attention-seeking. Its expression tells a story, adds humanity, and creates unresolved tension.
The AI ones are sharp and confident and eye-catching, zero subtlety, completely missing the point. I'm willing to bet a $40 designer would drop the ball in a different, equally bad way (probably make it too corporate, or miss the precise "cute but low-effort" spot the original designer hit).