No. Once the people have the time and leisure to think and mingle they might find out who the real source of the problem is. So it’s better to keep your slaves busy and struggling to keep the roof over their head and their belly not empty.

No.

These devices produce ionized air which is indeed claimed to deactivate viruses. Unless the device is defective ozone might only be produced as a byproduct in small quantities, due to the toxicity, you’ve mentioned.

The Chinese worker producing these bits was a bit inattentive at the end of his 14h shift. Cut him some slack!