I doubt he was tricked. He probably sold it to them or some bank.
If that dude wound up with child support, I don’t think I’d have any sympathy.
But then I don’t know what kind of legal entanglements they wind up with.
In this case it was a donor, but what’s the difference? Whether you’re donating deliberately or shooting your sperm all over the landscape with no concern for what can happen, the results are largely the same.