Why would anyone be afraid of these? You should be afraid of stealth drones three miles up with air to ground missiles. They are unstoppable without electronic countermeasures.
(To this day I remember this one thing about US drone strikes in Pakistan I read in an article many years ago: the people living there became literally afraid of the blue sky - as the drone strikes tended to happen during good weather. That's terror.)
Biped cyborg killer is just not a realistic weapon. The slaughterbot attack on Maduro in 2018 shows that technology is not very mature yet.