It uses the mitochondrial DNA of one individual to replace the mitochondrial DNA of another which is dysfunctional. Its not like it is using the genetic blueprint of 3 people to product a baby its like swapping out the dysfunctional cellular power plants which are what mitochondria are.
I don’t doubt that scientists at some point will want to try to create freak-shows to make ssm reproduction or even one person reproduction possible by using stem cells to artificially produce sperm and eggs.
Good luck with that.
Selfish Bozo’s having children for political reasons. Doesn’t anyone care about the innocent little child that just wants to be held and loved by it’s mother and father?