Having counselling available wouldn't make a blind bit of difference imho.
And while Ancestry may have a degree of obligation to its customers but what about all the people who aren't their customers? Say Joe does a test and finds out he has a paternal half sibling. Joe's Dad hates it and kicks off and refuses to engage. Equally Joe's Mum has a complete breakdown over it. Meanwhile Joe's sister is in complete denial and says it's been tampered with. But since none of the others have an ancestry account doesn't have access to any service that might be available and they are customers.
Ancestry are ultimately not responsible for the actions of the father. Nor should they be held accountable for revealing them.
And doing another test might reveal Joe's mum isn't his mum and that Joe's mum had another daughter who is unrelated to go. Rather than merely ending up being a way to access services.
If there's that much concern DNA tests for commercial purposes should be banned as they are in a few countries.
But they won't be.