It is simply an issue of humanity as well - nursing care is an immensely private issue for most people.

Not many adults would want to be filmed when he/she is getting their diapers changed after they soiled themselves accidentally. If you ask most older folks they don't even want their kids/relatives to be doing that out of shame. Most wouldn't want their kids/relatives to even be present. (Note: This is highly dependent on the culture, though, I can only speak for Western&Arab clients here)

Now imagine being the patient and not even knowing whether someone is watching. Besides - we often don't know enough about the actual relationship between the kids and the client. I've seen old folks agree to a lot of shit simply because of pressure ("I won't come and visit you anymore if you don't sign this"), extortion ("I only bring the grandkids of you wire me amount XY") or downright abuse.

The later is also an issue: There are perverts all around the net. I know of at least one instance when a hidden camera (in that case placed by nurse) was used to stream nursing situation to a fetish site on the net. Thankfully by sheer luck the whole operation failed spectacularly before any harm was done.

(The nurse placed the cam while the patient was away to dialysis. The patient collapsed there and sadly passed away in hospital. The nurse was unable to retrieve the camera due to being quarantined due to COVID. A relative who was either in IT sec or a LEO-i can't remember -of the patient removed the belongings and found the camera. Nurse caught themselves on cam when installing the cam and was charged, sentenced to two years on probation, a high fine and banned from ever working in a care job again. The only reason why no actual prison sentence was handed out was the confession which helped in a larger case.)