I guess I'm in the camp that considers your con a pro. If my Dad wasn't or isn't my biological dad, I would want to know. And I'd be grateful to any service that informed me.
I remember her and I both spitting into a tube in our SF apartment in San Francisco in 2012 and mailing them off.
A few years later, we look at the ancestry data and there is a big surprise (she was ~50% something that she was sure 0% before that).
Turns out her dad wasn’t her dad and she was donor conceived — this has potentially huge health implications if you don’t know this.
By some fortunate circumstance, she ultimately found the donor… and 27 (and counting) siblings! Turns out the clinic where this all went down at in the early 1980s was sketchy and lied to a whole bunch of people and misused samples.