HobbyPlodder

Depends on the recipient and size of the liver being donated. For instance, donation to a pediatric patient from an adult would be the left lateral lobe, which is about 25% of the total volume

Contact tracing within hospitals like mine (employee-patient, patient-patient, etc) is a complex enough problem, especially with drastic increases in potential vectors for exposure, so it would be very difficult to control for those variables right now to see what impact PPE changes would have.

Biology 101

Does health insurance typically cover the cost for voluntary donors? If not, does the medical system assist? What support services exist for donors?

All medical costs associated with living donations like the OP's are covered by the recipient's insurance and/or the institution doing the transplant. There will be a "donor advocate" assigned by the hospital during the process whose job it is to ensure the donor basically is treated well and isn't under duress. They are who would have passed along the anonymous letter from the OP to the recipient, and would be the one he sent along any "surprise" medical bills to.

Outside of that, it's down to the terms of your employment contract and your disability insurance whether or not you get paid for your leave post-surgery. There are NGOs like the National Living Donor Assistance Center who also provide financial assistance to donors who aren't getting anything from their employer/insurance.

Anecdotally, I know someone who was granted 10 weeks of "unpaid leave" by their employer, and the company's disability insurance plan paid 2/3rds salary to them while they were out.

Yes, let's not give Newsom credit for something that was already true for years before he was in office