Just leaving this here:
www.statnews.com/2017/01/28/egg-donors-risks/
It is an article about the fact that the long term health impacts for egg donors are still not well known. It mentions that
The one study on egg donors is a 2005 survey of 80 women who had donated eggs as long as two decades earlier. Thirteen of them said they were still experiencing physical effects that they attributed to the donation — things like ovarian cysts, fibroids, and infertility issues that arose later in life. But it was a small and unscientific sample, with no medical records to back up the women’s claims.
That is 16% of these women experienced issues.
How comfortable do those supporting people using donor eggs and surrogacy feel with that statistic?
That for every male couple getting a baby on demand, 1 out of 6 of those donating an egg may have significant impacts in the long term.
BUT this doesn't not cover those women who have had strokes and ovary torsion in the immediate or short term etc. These are also quite well documented by now in the USA due to the lack of care that some of these women receive after the 'harvest'.
Obviously, there are cases where a woman undergoing their own fertility treatment will donate remaining eggs. That seems to be a different scenario altogether - although there still could be coerciveness at play if she is pressured in ANY way to do so.