John J. Greene writes in his article, "Privacy & Anonymity in the Law"...
"Privacy; Anonymity...There’s not an advocate who breathes air that isn’t absolutely fed up hearing those two words. I heard those words from legislators, external organizations of interest, strangers on the street, family, and friends so much I wanted to be sick to my stomach! I really did."
....read the rest of his enlightening article here, about state adoption law which debunks the myth of birth parent anonymity.
The U.S. Court of Appeals, 6th Circuit Tennessee State Supreme Court, and the Oregon Court of Appeals (upheld by the Oregon Supreme Court) have affirmed that birth parents do not have a right of privacy or perpetual anonymity from their child. Seven US states have passed legislation restoring the unconditional right of adult adoptees to access their original birth certificate.
Here is a birth mother who writes in her article "Open Records vs. Birthmother Protection", asserting that she was never promised, nor asked, for anonymity; and other thoughts and articles in this post also addressing this long-standing issue.