I actually did do egg donation for a family member years ago, but thankfully it didn't work, the two times with mine they weren't viable and she used someone else's in the end.
It was the most painful, horrific experience I went through and I was v v young when I did it. I've kind of blocked out a lot of the experience. I'm horrified it's being advertised as a thing to just do now. I was kind of emotionally manipulated into it by said family member, now that I'm older and wiser and can see it. However at the time it was seen as supportive and kind. I certainly wouldn't have done it for a stranger.
She's now stopped speaking to me and my whole side of the family now anyway (nothing to do with that, just a whole other stupid reason years later), so that would have been a pretty awful situation if her children had been biologically mine!