These privacy laws need to be changed.They should,at least,have a time limit (at 21 the child can be given contact info),if not done away with completely.
They may even be sued to provide financial support in the future.
I'd be completely opposed to that.However,if a biological mother/father volunteered to assist a child...
So I go back to one of my original questions. Is your opposition and contract binding for 5 years, 5 months, 5 hours?
As you yourself said, no time limit, the contract can be overturned in a heartbeat. It's meaningless.
If this doublecross by the state stands, both natural parents of any child being place for adoption better start a college fund.
Without the rule of law we have the chaos this case illustrates.